fix(UI): consider 2px border at grid end

(cherry picked from commit 6b1c825741)

frappe/public/js/frappe/form/grid_row.js

@@ -930,7 +930,7 @@ export default class GridRow {
 					event.preventDefault();
 
 					let grid_start = inital_position_x - event.touches[0].clientX;
-					let grid_end = grid.clientWidth - grid_container.clientWidth;
+					let grid_end = grid.clientWidth - grid_container.clientWidth + 2;
 
 					if (grid_start < 0) {
 						grid_start = 0;