Fixed some issues with the old Rect class.
Fixed some issues with the old Rect class.

Rect#size would return a Rect with only 2 elements, which would break
Rect#to_s, Rect#inspect, and most methods that received the malformed
Rect (e.g. Surface#blit).

rubygame/rubygame,firstval/rubygame,Dami-coding/rubygame