Made showing format selection optional and default to false

src/components/post_status_form/post_status_form.js

@@ -139,6 +139,9 @@ const PostStatusForm = {
     },
     scopeOptionsEnabled () {
       return this.$store.state.config.scopeOptionsEnabled
+    },
+    formattingOptionsEnabled () {
+      return this.$store.state.config.formattingOptionsEnabled
     }
   },
   methods: {

src/components/post_status_form/post_status_form.vue

@@ -33,7 +33,7 @@
         @paste="paste">
       </textarea>
       <div class="visibility-tray">
-        <span class="text-format">
+        <span class="text-format" v-if="formattingOptionsEnabled">
           <label for="post-content-type" class="select">
             <select id="post-content-type" v-model="newStatus.contentType" class="form-control">
               <option value="text/plain">{{$t('post_status.content_type.plain_text')}}</option>