tests: elm: make cnt unsigned for correct compare

tests: elm: make cnt unsigned for correct compare

Not really somethign we would hit here but still better to change this.

tests/elementary/elm_test_config.c: In function ‘elm_config_profiles’:
tests/elementary/elm_test_config.c:206:12: warning: comparison between signed and unsigned integer
expressions [-Wsign-compare]
         fail_if(cnt != eina_list_count(list));