Build with symbol_level=0 for linux-archive-rel

This fixes binary size increase in the Linux archived builds after r663143.

BUG=977716
R=dpranke

Change-Id: Iad3cae54968effe5ec32213ef9f321705a25fd95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1672564Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671499}

tools/mb/mb_config.pyl

@@ -26,7 +26,7 @@
     'chromium': {
       'android-archive-rel': 'android_without_codecs_release_bot_minimal_symbols',
       'android-archive-dbg': 'android_without_codecs_debug_bot',
-      'linux-archive-rel': 'release_bot_minimal_symbols',
+      'linux-archive-rel': 'release_bot',
       'linux-archive-dbg': 'debug_bot',
       'mac-archive-rel': 'release_bot_mac_strip_minimal_symbols',
       'mac-archive-dbg': 'debug_bot',