use false instead of 0

Change-Id: I7210493b98e8ed778eeba6518dc131e63863ff67
at least some sanity for WinSalGraphics

we no longer invite everyone to change our member variables.

This was obviously written by a C programmer and needs further refactoring.

Change-Id: I896576a5abc24e8d03787d30e6ba6c11b0bf84c6