gui: use given button mode.

avr/modules/lcd2/gui/base/imagebutton.asm

@@ -26,6 +26,7 @@
 ; @param r17 value for WIDGET_OFFS_PACK
 ; @param r21:r20 img ressource
 ; @param r22     selector (target will be parent, can be overridden later)
+; @param r23     button mode
 ; @return CFLAG  set if new object created, cleared on error
 ; @return Y      button created
 ; @clobbers any, !X
@@ -36,7 +37,7 @@ ImageButton_new:
       push r20
         push r21
           push r22
-            ldi r20, BUTTON_MODE_NORMAL
+            mov r20, r23
             bigcall Button_new
           pop r22
         pop r21