[SER-2110][fix] button toggle and regex value in edit drawer

Author: John-Weak

plugins/data-manager/frontend/public/javascripts/countly.views.js

@@ -1131,11 +1131,12 @@
                 }
                 if (doc.actionType === 'EVENT_MERGE' && doc.isRegexMerge === true) {
                     doc.actionType = 'merge-regex';
+                    doc.eventTransformTargetRegex = doc.transformTarget[0];
                 }
                 else {
                     doc.actionType = doc.actionType.split('_')[1].toLowerCase();
                 }
-                doc.isExistingEvent = 'true';
+                doc.isExistingEvent = doc.isExistingEvent ? 'true' : 'false';
                 // doc.tab;
                 // delete doc.transformType;
                 doc.name = countlyCommon.unescapeHtml(doc.name);