ecore-x: Fix calls to disable dpms in xcb

Summary: We already have ecore_x_dpms code which handles this
properly, so call it here.

@fix

Signed-off-by: Chris Michael <cp.michael@samsung.com>

src/lib/ecore_x/xcb/ecore_xcb_screensaver.c

@@ -389,11 +389,11 @@ ecore_x_screensaver_resume(void)
 EAPI void
 ecore_x_screensaver_reset(void)
 {
-   xcb_dpms_disable(_ecore_xcb_conn);
+   ecore_x_dpms_enabled_set(0);
 }
 
 EAPI void
 ecore_x_screensaver_activate(void)
 {
-   xcb_dpms_enable(_ecore_xcb_conn);
+   ecore_x_dpms_enabled_set(1);
 }