Bazel: Fix build for headless WAR
Bazel: Fix build for headless WAR

Id45967aa8 broke headless rule:

no such target '//gerrit-gwtui:None': target 'None' not declared in
package 'gerrit-gwtui'

Change-Id: I726dee61c11caffa1889f948d3fb49a0123af9f6

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