Don't try to run database helpers as specs

Running

  $ bin/rspec -Ispec -rspec_helper --color --format documentation \
      spec/support/helpers/database
    Finished in 14.61 seconds (files took 55.56 seconds to load)
    0 examples, 0 failures

has no effect.

scripts/rspec_helpers.sh

@@ -98,7 +98,7 @@ function rspec_simple_job() {
 }
 
 function rspec_db_library_code() {
-  local db_files="spec/lib/gitlab/database/ spec/support/helpers/database/"
+  local db_files="spec/lib/gitlab/database/"
 
   rspec_simple_job "-- ${db_files}"
 }