Fix: Research pending and research unavailable

- RESEARCH_PENDING change from detecting "]" to detecting the letter, because the "]" is moving up and down randomly
- Screenshot speed back to normal after research_receive
- Add a max_color checker to RESEARCH_UNAVAILABLE and RESEARCH_START, because RESEARCH_UNAVAILABLE is a translucent item and color is changing according to research rarity

module/base/base.py

@@ -105,9 +105,6 @@ class ModuleBase:
 
         Args:
             button(Button): Button instance.
-
-        Returns:
-            PIL.Image.Image:
         """
         return self.device.image.crop(button.area)