Revert accidental change to test output level

This modification was merged without being caught in review [1]. We
don't need to have all test output by default as it's much nicer to
only have the errors.

[1] https://gerrit-review.googlesource.com/c/gerrit/+/323837/comment/7639bdee_ed65e59f/

Change-Id: Ibf78895e86d7e63c71fec72c36f75b5f9296068a
Release-Notes: skip
diff --git a/.bazelrc b/.bazelrc
index 407b005..cf5403d 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -37,6 +37,6 @@
 build --announce_rc
 
 test --build_tests_only
-test --test_output=all
+test --test_output=errors
 
 import %workspace%/tools/remote-bazelrc