Dismiss all modals when starting new activity

When starting new activity after previous activity showed modals
and did not dismiss them. The modal controller still had
registered modals even though we can't go back in the activity stack.

android/app/src/main/java/com/reactnativenavigation/modules/RctActivityModule.java

             if(ContextProvider.getActivityContext() instanceof RootActivity) {
                 context.overridePendingTransition(0, 0);
             }
+
+            // Dismiss modals associated with previous activity
+            ModalController.getInstance().dismissAllModals();
         }
     }
 
             if(ContextProvider.getActivityContext() instanceof RootActivity) {
                 context.overridePendingTransition(0, 0);
             }
+
+            // Dismiss modals associated with previous activity
+            ModalController.getInstance().dismissAllModals();
         }
     }