Removed Graphics.delta_s and the usage thereof, tweaked credits screen code

Data/Scripts/001_Technical/005_PluginManager.rb

@@ -395,8 +395,8 @@ module PluginManager
     # output message
     print("#{message}\r\nThis exception was logged in #{errorlogline}.\r\nHold Ctrl when closing this message to copy it to the clipboard.")
     # Give a ~500ms coyote time to start holding Control
-    t = System.delta
-    until (System.delta - t) >= 500_000
+    t = System.uptime
+    until System.uptime - t >= 0.5
       Input.update
       if Input.press?(Input::CTRL)
         Input.clipboard = message