Fix the group name of linux-lacros-rel

Bug: 1116180
Change-Id: Ida6cf332036dec7bcfa2b78efbfb19a278e59a42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357680
Auto-Submit: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Sven Zheng <svenzheng@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798380}

tools/mb/mb_config.pyl

@@ -135,7 +135,6 @@
       'linux-chromeos-rel': 'chromeos_with_codecs_release_bot',
       'linux-chromeos-dbg': 'chromeos_with_codecs_debug_bot',
       'linux-lacros-builder-rel': 'lacros_on_linux_release_bot',
-      'linux-lacros-rel': 'lacros_on_linux_release_bot',
       'linux-lacros-tester-rel': 'lacros_on_linux_release_bot',
     },
 
@@ -826,6 +825,7 @@
       'linux-chromeos-compile-dbg': 'chromeos_with_codecs_debug_bot',
       'linux-chromeos-dbg': 'chromeos_with_codecs_debug_bot',
       'linux-lacros-compile-rel': 'lacros_on_linux_release_bot',
+      'linux-lacros-rel': 'lacros_on_linux_release_bot',
     },
 
     'tryserver.chromium.codesearch': {