test(overmind): fix reaction tests

Author: christianalfoni

packages/node_modules/overmind/src/reaction.test.ts

@@ -84,7 +84,7 @@ describe('Reaction', () => {
         runCount++
         expect(foo.bar).toBe('baz2')
       },
-      true
+      { nested: true }
     )
 
     app.actions.changeFoo()
@@ -130,7 +130,7 @@ describe('Reaction', () => {
           runCount++
           expect(foo.bar).toBe('baz2')
         },
-        true
+        { nested: true }
       )
     }).toThrow()
   })