ESLint rules: array-callback-return, no-invalid-this, func-style (#3151)

* satisfied array-callback-return rule
* satisfying no-invalid-this rule
* fixed invalid-this issues
* changed isNotEqual to arrow function
* added rule func-style
* added return false to satisfy array-callback-return rule

Co-authored-by: Joel McKinnon <jmckinnon@apple.com>
Co-authored-by: Joshi <simplyrender@gmail.com>
Co-authored-by: Andrew Henry <akhenry@gmail.com>

src/plugins/condition/components/inspector/StylesView.vue

@@ -431,20 +431,22 @@ export default {
         },
         addConditionSet() {
             let conditionSetDomainObject;
-            const handleItemSelection = (item) => {
+            let self = this;
+            function handleItemSelection(item) {
                 if (item) {
                     conditionSetDomainObject = item;
                 }
-            };
+            }
 
-            const dismissDialog = (overlay, initialize) => {
+            function dismissDialog(overlay, initialize) {
                 overlay.dismiss();
+
                 if (initialize && conditionSetDomainObject) {
-                    this.conditionSetDomainObject = conditionSetDomainObject;
-                    this.conditionalStyles = [];
-                    this.initializeConditionalStyles();
+                    self.conditionSetDomainObject = conditionSetDomainObject;
+                    self.conditionalStyles = [];
+                    self.initializeConditionalStyles();
                 }
-            };
+            }
 
             let vm = new Vue({
                 provide: {