Remove duplicate properties in CSS and few js standard fixes reported by SonarQube.

web/pgadmin/dashboard/static/js/dashboard.js

@@ -508,6 +508,8 @@ define('pgadmin.dashboard', [
           for (var time_ind = 0; time_ind < dataset[label_ind]['data'].length; time_ind++) {
             dataset[label_ind]['data'][time_ind][0] = time_ind;
           }
+
+          return;
         });
         counter_prev_data = new_data;
       }

web/pgadmin/misc/file_manager/static/css/file_manager.css

@@ -85,7 +85,6 @@ div.clip {
 
 .file_listing #contents.list td:first-child {
   display: table-cell;
-  padding-left: 0;
   width: 100%;
   padding-left: 12px;
   background-repeat: no-repeat;

web/pgadmin/misc/file_manager/static/scss/_file_manager.scss

@@ -190,7 +190,6 @@
 }
 
 .upload_file .file_upload_main {
-  position: relative;
   height: 127px;;
   width: 120px;
   display: inline-block;
@@ -201,7 +200,6 @@
   -webkit-border-radius: 5px;
   -moz-border-radius: 5px;
   background: $color-bg;
-  margin: 2px;
   opacity: 1;
 }
 

web/pgadmin/misc/static/explain/scss/_explain.scss

@@ -98,7 +98,6 @@ div.tab-pane[data-explain-tabpanel=table] {
           white-space: pre-wrap;
           word-wrap: break-word;
           white-space: -webkit-pre-wrap;
-          word-break: break-all;
           white-space: normal;
         }
         &.pg-ex-highlighter {