Revert "[vim] set font size based on screen resolution"

This reverts commit 0c0cfe662aa091c94b9caea86cbde1211852e7b3.
Revert "[vim] increased the gvim font size"

This reverts commit f6f7e77c5db5abc93cec9e1e562f154e845d4363.
[git] reduced gitk font size