git: change gvim font to Monaco
git: change gvim font to Monaco

The previous font was Consolas. This font is not installed by default
and if it's missing, the gvim custom font size will also be dropped.

Monaco is a default system font on OS X and is a more suitable gvim
default.

pertoyra/dotfiles,sdillingham/dotfiles,saclark/dotfiles,SBoudrias/dotfiles,codfish/dotfiles,bronxct1/dotfiles,Stubby/dotfiles,nick-thompson/dotfiles,Stubby/dotfiles,micahwood/linux-dotfiles,micahwood/linux-dotfiles,senorflor/dotfiles,Gastove/dotfiles,bronxct1/dotfiles,micahwood/linux-dotfiles,intiocean/dotfiles,marc0uk/dotfiles,seiryu9/dotfiles,seiryu9/dotfiles,necolas/dotfiles,codfish/dotfiles,senorflor/linux-dotfiles,SiTaggart/dotfiles,micahwood/linux-dotfiles,jmyser/dotfiles,lgaechter/dotfiles,micahwood/linux-dotfiles,pmacom/dotfiles