Use 32-bit visual by default if available.

With this patch, we use 32-bit visuals per default whenever it is
available. Otherwise, we fall back to the actual root window's
depth, which will typically be 24-bit.

Before this patch, we already used 32-bit depth for containers with
a window that uses 32-bit. However, this means that we didn't use
32-bit for split parent containers on which decoration is drawn.
For 32-bit windows using transparency, this caused a graphical glitch
because the decoration pixmap behind it would show through. This
behavior is fixed with this change.

relates to #1278

src/xcb.c

@@ -252,6 +252,11 @@ uint16_t get_visual_depth(xcb_visualid_t visual_id) {
     }
     return 0;
 }
+
+/*
+ * Get visual type specified by visualid
+ *
+ */
 xcb_visualtype_t *get_visualtype_by_id(xcb_visualid_t visual_id) {
     xcb_depth_iterator_t depth_iter;