Revert "Fix touch not working due to gr_fb_width returning 0 in some cases"

This reverts commit 70e1129612765b14e5aace0155d4683c91cde951.
No longer needed after http://review.teamw.in/#/c/655/
diff --git a/gui/gui.cpp b/gui/gui.cpp
index 9f22138..8755689 100644
--- a/gui/gui.cpp
+++ b/gui/gui.cpp
@@ -185,8 +185,6 @@
   static struct timeval touchStart;
   HardwareKeyboard kb;
   string seconds;
-  int screen_width = gr_fb_width();
-  int screen_height = gr_fb_height();
 
   //start screen timeout threads
   blankTimer.setTimerThread();
@@ -200,7 +198,7 @@
 	  struct input_event ev;
 	  int state = 0, ret = 0;
 
-	  ret = ev_get (&ev, dontwait, &screen_width, &screen_height);
+	  ret = ev_get (&ev, dontwait);
 
 	  if (ret < 0)
 		{