Elixir 1.19: Fix ConfigDBTest regex tests

It is not possible match regexes anymore as this worked by accident
previously. Instead, at least check that the sources of the regex (the
regex itself) match.

Notice the +1 difference in the regex Reference below.

1) test to_elixir_types/1 complex keyword with sigil (Pleroma.ConfigDBTest)
   test/pleroma/config_db_test.exs:460
   Assertion with == failed
   code:  assert ConfigDB.to_elixir_types([
            %{"tuple" => [":federated_timeline_removal", []]},
            %{"tuple" => [":reject", ["~r/comp[lL][aA][iI][nN]er/"]]},
            %{"tuple" => [":replace", []]}
          ]) == [federated_timeline_removal: [], reject: [~r/comp[lL][aA][iI][nN]er/], replace: []]
   left:  [federated_timeline_removal: [], reject: [%Regex{opts: [], re_pattern: {:re_pattern, 0, 0, 0, #Reference<0.230935836.591265794.259515>}, source: "comp[lL][aA][iI][nN]er"}], replace: []]
   right: [federated_timeline_removal: [], reject: [%Regex{opts: [], re_pattern: {:re_pattern, 0, 0, 0, #Reference<0.230935836.591265794.259516>}, source: "comp[lL][aA][iI][nN]er"}], replace: []]
   stacktrace:
     test/pleroma/config_db_test.exs:461: (test)

test/pleroma/config_db_test.exs

@@ -273,24 +273,24 @@ defmodule Pleroma.ConfigDBTest do
     end
 
     test "sigil" do
-      assert ConfigDB.to_elixir_types("~r[comp[lL][aA][iI][nN]er]") == ~r/comp[lL][aA][iI][nN]er/
+      assert ConfigDB.to_elixir_types("~r[comp[lL][aA][iI][nN]er]").source == ~r/comp[lL][aA][iI][nN]er/.source
     end
 
     test "link sigil" do
-      assert ConfigDB.to_elixir_types("~r/https:\/\/example.com/") == ~r/https:\/\/example.com/
+      assert ConfigDB.to_elixir_types("~r/https:\/\/example.com/").source == ~r/https:\/\/example.com/.source
     end
 
     test "link sigil with um modifiers" do
-      assert ConfigDB.to_elixir_types("~r/https:\/\/example.com/um") ==
+      assert ConfigDB.to_elixir_types("~r/https:\/\/example.com/um").source ==
-               ~r/https:\/\/example.com/um
+               ~r/https:\/\/example.com/um.source
     end
 
     test "link sigil with i modifier" do
-      assert ConfigDB.to_elixir_types("~r/https:\/\/example.com/i") == ~r/https:\/\/example.com/i
+      assert ConfigDB.to_elixir_types("~r/https:\/\/example.com/i").source == ~r/https:\/\/example.com/i.source
     end
 
     test "link sigil with s modifier" do
-      assert ConfigDB.to_elixir_types("~r/https:\/\/example.com/s") == ~r/https:\/\/example.com/s
+      assert ConfigDB.to_elixir_types("~r/https:\/\/example.com/s").source == ~r/https:\/\/example.com/s.source
     end
 
     test "raise if valid delimiter not found" do
@@ -460,11 +460,11 @@ defmodule Pleroma.ConfigDBTest do
     test "complex keyword with sigil" do
       assert ConfigDB.to_elixir_types([
                %{"tuple" => [":federated_timeline_removal", []]},
-               %{"tuple" => [":reject", ["~r/comp[lL][aA][iI][nN]er/"]]},
+               %{"tuple" => [":reject", [~r/comp[lL][aA][iI][nN]er/.source]]},
                %{"tuple" => [":replace", []]}
              ]) == [
                federated_timeline_removal: [],
-               reject: [~r/comp[lL][aA][iI][nN]er/],
+               reject: [~r/comp[lL][aA][iI][nN]er/.source],
                replace: []
              ]
     end