ZKL-Linux tweak: workaround for MONO's playerListBox always cut off last 3 line (added 3 empty line.)

Should recheck in future when its fixed in MONO, see if it still look okay.
PlayerListBox.cs: make previous workaround compatible with DPI scaling

Utils.cs: cleanup to DPI scaling code to make it look compact
ZeroKLobby.csproj: fix compiling ZKL on 32-bit Windows. Change "C:\Program Files (x86)\" to a generic "%ProgramFiles%"

64-bit Window will still point correctly to "C:\Program Files (x86)\" because the "Target Platform" is set to "x86"
Merge pull request #283 from xponen/zkl_linux_playerlistbox_cutoff_workaround

ZKL: Linux workaround for playerListBox always cut off last 3 player name