Fix formatting guide violations (spaces instead of tabs)

include/extensions.h

@@ -7,37 +7,37 @@
 #include "list.h"
 
 struct background_config {
-        wlc_handle output;
-        wlc_resource surface;
-        // we need the wl_resource of the surface in the destructor
-        struct wl_resource *wl_surface_res;
-        // used to determine if client is a background
+	wlc_handle output;
+	wlc_resource surface;
+	// we need the wl_resource of the surface in the destructor
+	struct wl_resource *wl_surface_res;
+	// used to determine if client is a background
 	struct wl_client *client;
 };
 
 struct panel_config {
-        // wayland resource used in callbacks, is used to track this panel
-        struct wl_resource *wl_resource;
-        wlc_handle output;
-        wlc_resource surface;
-        // we need the wl_resource of the surface in the destructor
-        struct wl_resource *wl_surface_res;
-        enum desktop_shell_panel_position panel_position;
-        // used to determine if client is a panel
+	// wayland resource used in callbacks, is used to track this panel
+	struct wl_resource *wl_resource;
+	wlc_handle output;
+	wlc_resource surface;
+	// we need the wl_resource of the surface in the destructor
+	struct wl_resource *wl_surface_res;
+	enum desktop_shell_panel_position panel_position;
+	// used to determine if client is a panel
 	struct wl_client *client;
 };
 
 struct desktop_shell_state {
-        list_t *backgrounds;
-        list_t *panels;
-        list_t *lock_surfaces;
-        bool is_locked;
+	list_t *backgrounds;
+	list_t *panels;
+	list_t *lock_surfaces;
+	bool is_locked;
 };
 
 struct swaylock_state {
-        bool active;
-        wlc_handle output;
-        wlc_resource surface;
+	bool active;
+	wlc_handle output;
+	wlc_resource surface;
 };
 
 extern struct desktop_shell_state desktop_shell;