compositor: fix leaking log_scopes

Found by ASan:

Direct leak of 30 byte(s) in 1 object(s) allocated from:
    #0 0x7f4dcf029810 in strdup (/lib/x86_64-linux-gnu/libasan.so.5+0x3a810)
    #1 0x7f4dcefd2143 in handle_option ../../git/weston/shared/option-parser.c:56
    #2 0x7f4dcefd2473 in long_option ../../git/weston/shared/option-parser.c:84
    #3 0x7f4dcefd2bb6 in parse_options ../../git/weston/shared/option-parser.c:175
    #4 0x7f4dcefc7b0d in wet_main ../../git/weston/compositor/main.c:3229
    #5 0x5593dfa38ffd in execute_compositor ../../git/weston/tests/weston-test-fixture-compositor.c:432
    #6 0x5593dfa3ca69 in weston_test_harness_execute_as_client ../../git/weston/tests/weston-test-runner.c:528
    #7 0x5593dfa2e511 in fixture_setup ../../git/weston/tests/ivi-shell-app-test.c:139
    #8 0x5593dfa2e596 in fixture_setup_run_ ../../git/weston/tests/ivi-shell-app-test.c:141
    #9 0x5593dfa3d01e in main ../../git/weston/tests/weston-test-runner.c:661
    #10 0x7f4dcec2d09a in __libc_start_main ../csu/libc-start.c:308
    #11 0x5593dfa2d769 in _start (/home/pq/build/weston-meson/tests/test-ivi-shell-app+0xd769)

when running

	ASAN_OPTIONS=fast_unwind_on_malloc=0,malloc_context_size=50 \
	LSAN_OPTIONS=suppressions=/home/pq/git/weston/.gitlab-ci/leak-sanitizer.supp \
	./tests/test-ivi-shell-app

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

compositor/main.c

@@ -3493,6 +3493,7 @@ out_display:
 	free(socket_name);
 	free(option_modules);
 	free(log);
+	free(log_scopes);
 	free(modules);
 
 	return ret;