Revert "Allow load labels to cross package boundaries by default"

This reverts commit 4d39f31cf52d1abe57c2decb6812c2e48c1cdd66.

This option was flipped in Bazel. The fact we are still using it
makes Gerrit not forward compatible with Bazel, that removed this
option. Gerrit build is now broken on Bazel CI.

Bug: Issue 11122
Change-Id: Id7f3c69a638029a5d5d276529b3fcc1b2c8dac16

.bazelrc

diff --git a/.bazelrc b/.bazelrc
index 8b1abd6..d6d4ce6 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -4,7 +4,6 @@
 build --action_env=PATH
 build --disk_cache=~/.gerritcodereview/bazel-cache/cas
 build --java_toolchain //tools:error_prone_warnings_toolchain
-build --incompatible_disallow_load_labels_to_cross_package_boundaries=false
 
 test --build_tests_only
 test --test_output=errors