Fix label shadows drawing out of bounds

Shadows would be drawn out of bounds and wrap to opposite edge of screen

Author: LeviathaninWaves

tobkit/source/widget.cpp

@@ -171,6 +171,12 @@ ITCM_CODE
 void Widget::drawBox(u8 tx, u8 ty, u8 tw, u8 th, u16 col)
 {
 	uint_fast8_t i,j;
+	//Are we about to draw out of bounds?
+	if(tx+tw>255) {
+		u8 tempResult;
+		tempResult = (tx + tw) - 255;
+		tw = tw-tempResult;
+	}
 	for(i=0;i<tw;++i) {
 		drawPixel(i+tx, ty, col);
 		drawPixel(i+tx, ty+th-1, col);