fix: share dialog with modal (#988)

Co-authored-by: Shruthi R Salian <[email protected]>

Author: ShruthiRSalian

ios/RNShare.m

@@ -267,7 +267,13 @@ - (NSDictionary *)constantsToExport
 
         // always dismiss since this may be called from cancelled shares
         // but the share menu would remain open, and our callback would fire again on close
-        [controller dismissViewControllerAnimated:true completion:nil];
+        if(weakShareController){
+            // closing activity view controller
+            [weakShareController dismissViewControllerAnimated:true completion:nil];
+        } else {
+            [controller dismissViewControllerAnimated:true completion:nil];
+        }
+
 
         if (activityError) {
             failureCallback(activityError);