MM-44148: fix race in CRT settings test (#20196)

* MM-44148: Remove test parallization to prevent race

* don't export pointer to loop variable

* capture whole loop variable

app/channel_test.go

@@ -2448,7 +2448,6 @@ func TestMarkUnreadWithThreads(t *testing.T) {
 }
 
 func TestIsCRTEnabledForUser(t *testing.T) {
-	t.Skip("MM-44148")
 	type preference struct {
 		val string
 		err error
@@ -2511,7 +2510,6 @@ func TestIsCRTEnabledForUser(t *testing.T) {
 	for _, tc := range testCases {
 		tc := tc
 		t.Run(tc.desc, func(t *testing.T) {
-			t.Parallel()
 			th := SetupWithStoreMock(t)
 			defer th.TearDown()