weston-info: do not round refresh rates

Weston-info was accidentally rounding refresh rates to integer Hz.

Fix it to print 3 decimals, as the protocol carries exactly that.

Reported-by: Michel Dänzer <michel@daenzer.net>
Cc: John Galt <johngaltfirstrun@gmail.com>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Michel Dänzer <michel@daenzer.net>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>

clients/weston-info.c

@@ -226,7 +226,7 @@ print_output_info(void *data)
 	wl_list_for_each(mode, &output->modes, link) {
 		printf("\tmode:\n");
 
-		printf("\t\twidth: %d px, height: %d px, refresh: %.f Hz,\n",
+		printf("\t\twidth: %d px, height: %d px, refresh: %.3f Hz,\n",
 		       mode->width, mode->height,
 		       (float) mode->refresh / 1000);