implement ChoiceSetting for settings modal similar to BooleanSetting

src/components/settings_modal/helpers/choice_setting.vue

@@ -0,0 +1,29 @@
+<template>
+  <label
+    class="ChoiceSetting"
+  >
+    <slot />
+    <Select
+      :value="state"
+      :disabled="disabled"
+      @change="update"
+    >
+      <option
+        v-for="option in options"
+        :key="option.key"
+        :value="option.value"
+      >
+        {{ option.label }}
+        {{ option.value === defaultValue ? $t('settings.instance_default_simple') : '' }}
+      </option>
+    </Select>
+    <ModifiedIndicator :changed="isChanged" />
+  </label>
+</template>
+
+<script src="./choice_setting.js"></script>
+
+<style lang="scss">
+.ChoiceSetting {
+}
+</style>