Add lukasza@chronium.org to //tools/vim/OWNERS

Bug: none
Change-Id: I9691adc8e1a1e652e3f5c9b54746bd358b91ad5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096105
Auto-Submit: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748694}

tools/vim/OWNERS

 asanka@chromium.org
 dcheng@chromium.org
 eroman@chromium.org
+lukasza@chromium.org
 scottmg@chromium.org
 
 # COMPONENT: Tools