Fix naming conventions on some stats widget events for the Mixpanel tracker.

Author: daniloercoli

WordPressAnalytics/src/main/java/org/wordpress/android/analytics/AnalyticsTrackerMixpanel.java

@@ -667,19 +667,19 @@ private AnalyticsTrackerMixpanelInstructionsForStat instructionsForStat(
                 break;
             case STATS_SELECTED_INSTALL_JETPACK:
                 instructions = AnalyticsTrackerMixpanelInstructionsForStat.
-                        mixpanelInstructionsForEventName("Selected Install Jetpack");
+                        mixpanelInstructionsForEventName("Stats - Selected Install Jetpack");
                 break;
             case STATS_WIDGET_ADDED:
                 instructions = AnalyticsTrackerMixpanelInstructionsForStat.
-                        mixpanelInstructionsForEventName("Stats Widget Added");
+                        mixpanelInstructionsForEventName("Stats - Widget Added");
                 break;
             case STATS_WIDGET_REMOVED:
                 instructions = AnalyticsTrackerMixpanelInstructionsForStat.
-                        mixpanelInstructionsForEventName("Stats Widget Removed");
+                        mixpanelInstructionsForEventName("Stats - Widget Removed");
                 break;
             case STATS_WIDGET_TAPPED:
                 instructions = AnalyticsTrackerMixpanelInstructionsForStat.
-                        mixpanelInstructionsForEventName("Stats Widget Tapped");
+                        mixpanelInstructionsForEventName("Stats - Widget Tapped");
                 break;
             case PUSH_NOTIFICATION_RECEIVED:
                 instructions = AnalyticsTrackerMixpanelInstructionsForStat.