Update codereview.settings to set --squash as the default for git cl
Update codereview.settings to set --squash as the default for git cl

Change-Id: I4d5ee3a8a3a39b34bee6ad616646966e986132b1
Reviewed-on: https://chromium-review.googlesource.com/324958
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>

chromium/crashpad,chromium/crashpad,atom/crashpad,chromium/crashpad,atom/crashpad,atom/crashpad