Fix editing of page-loaded file

getContent was called for the file and the directory it was in causing
`isTree` to change to `true`. Then when you went to edit the file, it
was still `true`.

app/assets/javascripts/repo/components/repo_editor.vue

@@ -38,7 +38,6 @@ const RepoEditor = {
     setupEditor() {
       this.showHide();
 
-      if (this.isTree) return;
       Helper.setMonacoModelFromLanguage();
     },
 
@@ -114,7 +113,7 @@ const RepoEditor = {
     },
 
     blobRaw() {
-      if (Helper.monacoInstance) {
+      if (Helper.monacoInstance && !this.isTree) {
         this.setupEditor();
       }
     },