Changed `true` string to a boolean

Fixed toBeTruthy to toBe(true) in spec

app/assets/javascripts/diffs/store/utils.js

@@ -55,7 +55,7 @@ export function getNoteFormData(params) {
     note_project_id: '',
     target_type: noteableData.targetType,
     target_id: noteableData.id,
-    return_discussion: 'true',
+    return_discussion: true,
     note: {
       note,
       position,

spec/javascripts/diffs/store/actions_spec.js

@@ -271,8 +271,8 @@ describe('DiffsStoreActions', () => {
 
       startRenderDiffsQueue({ state, commit: pseudoCommit });
 
-      expect(state.diffFiles[0].renderIt).toBeTruthy();
-      expect(state.diffFiles[1].renderIt).toBeTruthy();
+      expect(state.diffFiles[0].renderIt).toBe(true);
+      expect(state.diffFiles[1].renderIt).toBe(true);
     });
   });