gui: UITextureButton - make hover and press texture optional (#1414)

Author: eruvanos

arcade/gui/widgets/buttons.py

@@ -108,6 +108,9 @@ def __init__(
 
         if texture:
             self._textures["normal"] = texture
+            self._textures["hover"] = texture
+            self._textures["press"] = texture
+            self._textures["disabled"] = texture
         if texture_hovered:
             self._textures["hover"] = texture_hovered
         if texture_pressed: