[NTP] Fix menu options selectable outside of focus area

Remove line-height, which was causing the area outside the actual size
of the menu option to be selectable.

Before: https://drive.google.com/open?id=16vEe60P6VDgFI1SKzexUS3mrZroQll-I
After: https://drive.google.com/open?id=1QE7I6ig2lnomxVNxDG3bS_KvabJSw6s1

Bug: 1011802
Change-Id: I1c762703bb6b59a099477d4706618bf307179d53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845697Reviewed-by: Kyle Milka <kmilka@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703478}

chrome/browser/resources/local_ntp/local_ntp.css

@@ -945,7 +945,6 @@ html[dir=rtl] #error-notice.has-link #error-notice-msg {
   font-size: 14px;
   height: 32px;
   left: 0;
-  line-height: 32px;
   margin-bottom: 16px;
   outline: none;
   text-align: start;