Remove unused build var

Looks like this was left in by mistake when the docker tests were
re-added.

Change-Id: Ie0b26072824974cc340743fde13792a0a37eb889

BUILD

diff --git a/BUILD b/BUILD
index 4070a77..71977a6 100644
--- a/BUILD
+++ b/BUILD
@@ -53,8 +53,6 @@
 
 QUERY_TESTS_DEP = "//javatests/com/google/gerrit/server/query/%s:abstract_query_tests"
 
-ACCOUNT_QUERY_TESTS_DEP = "//javatests/com/google/gerrit/server/query/account:abstract_query_tests"
-
 TYPES = [
     "account",
     "change",