Don't offset the view if there's no text input rect

Otherwise this will shift the entire view upwards, which probably isn't what you want.

src/video/uikit/SDL_uikitviewcontroller.m

@@ -609,7 +609,7 @@ - (void)updateKeyboard
     CGRect frame = UIKit_ComputeViewFrame(window, data.uiwindow.screen);
 #endif
 
-    if (self.keyboardHeight) {
+    if (self.keyboardHeight && self.textInputRect.h) {
         int rectbottom = (int)(self.textInputRect.y + self.textInputRect.h);
         int keybottom = (int)(self.view.bounds.size.height - self.keyboardHeight);
         if (keybottom < rectbottom) {