Quick fix to camera glitch bug

Quick fix to camera glitch bug
Does not fix the cause, but rather get around it.

I'm guessing that because player is not placed directly at right edge of screen (there is little space between them) and camera is placed where player is, there become difference. 
And when camera is updated, because player moves, is this difference fixed causing camera to glitch.

This fix just ignores player position and place camera directly at right edge of screen.

( second line is only modified to math fixed line style. following [Style Guide for Python Code](http://legacy.python.org/dev/peps/pep-0008/#other-recommendations) )