Do not add OWNERS to bingo's .gitignore (#2122)

bingo overwrites the .gitignore file, so it can create an unexpected
merge conflict.

Leave the OWNERS file in place (unless we discover that it is also
a problem later).

Signed-off-by: Todd Short <[email protected]>

Author: tmshort

.bingo/.gitignore

@@ -9,6 +9,5 @@
 !README.md
 !Variables.mk
 !variables.env
-!OWNERS
 
 *tmp.mod