Ensure integer compare in Special:WantedCategories

For some reasons the qc_value from the query is returned as string, not
integer. The strict unequal comparision gives always true and that
results in unwanted "1 -> 1 member". Added a intval call.

Bug: T76910
Change-Id: I26e2718e418f35e2e10565c747a8f06f2bbb5ba3