Fix indentation all through the project

Fixes a “regression” from 04918f3b0bb9121d550e6b397b3fd9258e95734d, but
also other missed pieces.
diff --git a/libweston/compositor.c b/libweston/compositor.c
index 8f29ee2..5ba909f 100644
--- a/libweston/compositor.c
+++ b/libweston/compositor.c
@@ -4927,9 +4927,9 @@
 weston_compositor_dpms(struct weston_compositor *compositor,
 		       enum dpms_enum state)
 {
-        struct weston_output *output;
+	struct weston_output *output;
 
-        wl_list_for_each(output, &compositor->output_list, link)
+	wl_list_for_each(output, &compositor->output_list, link)
 		if (output->set_dpms)
 			output->set_dpms(output, state);
 }