Fix tests

Signed-off-by: Sahil Kumar <[email protected]>

test/src/reaction_bubble_test.dart

@@ -19,6 +19,7 @@ void main() {
                 reactions: [],
                 borderColor: Colors.black,
                 backgroundColor: Colors.white,
+                maskColor: Colors.white,
               ),
             ),
           ),
@@ -56,6 +57,7 @@ void main() {
                 ],
                 borderColor: Colors.black,
                 backgroundColor: Colors.white,
+                maskColor: Colors.white,
               ),
             ),
           ),
@@ -96,6 +98,7 @@ void main() {
                 ],
                 borderColor: Colors.black,
                 backgroundColor: Colors.white,
+                maskColor: Colors.white,
               ),
             ),
           ),