cosmetic: Whitespace cleanup of wayland client files

Summary:
cosmetic: Cleanup whitespace for wayland compositor

There is excess trailing whitespace in several of the files for the
wayland implementation.  These patches attempt to apply the spacing
rules for Enlightenment as documented at:
https://phab.enlightenment.org/w/coding_convention/

The whitespace rules are applied using the following emacs tabbing
settings:

 (defun start-efl-c-mode ()
  "C mode with adjusted defaults for use with Enlightenment
  development."
  (interactive)
  (c-mode)
  (c-set-style "gnu")
  (setq tab-width 8)
  (setq indent-tabs-mode nil)
  (setq c-basic-offset 3)
  (setq defun-block-intro 3)
  (setq statement-block-intro 3)
  (setq case-label 1)
  (setq statement-case-intro 3)
 )

This patchset also eliminates all tabs in favor of whitespace, as per
the coding style rules.

Reviewers: zmike, cedric, devilhorns

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D2048

src/modules/wl_desktop_shell/e_mod_main.c

@@ -1279,7 +1279,7 @@ _e_xdg_shell_cb_popup_get(struct wl_client *client, struct wl_resource *resource
      {
         wl_resource_post_error(surface_resource,
                                WL_DISPLAY_ERROR_INVALID_OBJECT,
-	                       "Popup requires a parent shell surface");
+                               "Popup requires a parent shell surface");
         return;
      }