Move gamerenderfixed() in between gameinput() and gamelogic()

Line clipping and second-frame edge-flipping have been broken since #539
was merged (d910c5118d). The cause of this
is moving the onground/onroof code around.

A proper loop order fix is going to come once #535 gets finalized and
merged, so this is a stopgap measure just to make sure people don't
report that line clipping or second-frame edge-flipping are broken in
current builds of 2.3.

desktop_version/src/main.cpp

@@ -573,8 +573,8 @@ void inline fixedloop()
             }
 
             gameinput();
-            gamelogic();
             gamerenderfixed();
+            gamelogic();
 
 
             break;