Passing t to all tests setup functions (#13841)

* Passing t to all tests setup functions

* Fixing build

app/post_test.go

@@ -445,7 +445,7 @@ func TestPostChannelMentions(t *testing.T) {
 }
 
 func TestImageProxy(t *testing.T) {
-	th := Setup(t).InitBasic()
+	th := Setup(t)
 	defer th.TearDown()
 
 	th.App.UpdateConfig(func(cfg *model.Config) {