[clean] Remove useless IFS save

bin/blackbox_diff

@@ -17,8 +17,6 @@ fi
 
 prepare_keychain
 
-OLDIFS=$IFS
-
 modified_files=()
 echo '========== DIFFING FILES: START'
 while IFS= read <&99 -r unencrypted_file; do
@@ -38,8 +36,6 @@ echo '========== DIFFING FILES: DONE'
 
 fail_if_keychain_has_secrets
 
-IFS=$OLDIFS
-
 echo '========== DONE.'
 
 if [ ${#modified_files[@]} -eq 0 ] ; then