wlr/types: use bitshifts for tablet axes enum

include/wlr/types/wlr_tablet_tool.h

@@ -77,15 +77,15 @@ struct wlr_tablet {
 };
 
 enum wlr_tablet_tool_axes {
-	WLR_TABLET_TOOL_AXIS_X = 1,
-	WLR_TABLET_TOOL_AXIS_Y = 2,
-	WLR_TABLET_TOOL_AXIS_DISTANCE = 4,
-	WLR_TABLET_TOOL_AXIS_PRESSURE = 8,
-	WLR_TABLET_TOOL_AXIS_TILT_X = 16,
-	WLR_TABLET_TOOL_AXIS_TILT_Y = 32,
-	WLR_TABLET_TOOL_AXIS_ROTATION = 64,
-	WLR_TABLET_TOOL_AXIS_SLIDER = 128,
-	WLR_TABLET_TOOL_AXIS_WHEEL = 256,
+	WLR_TABLET_TOOL_AXIS_X = 1 << 0,
+	WLR_TABLET_TOOL_AXIS_Y = 1 << 1,
+	WLR_TABLET_TOOL_AXIS_DISTANCE = 1 << 2,
+	WLR_TABLET_TOOL_AXIS_PRESSURE = 1 << 3,
+	WLR_TABLET_TOOL_AXIS_TILT_X = 1 << 4,
+	WLR_TABLET_TOOL_AXIS_TILT_Y = 1 << 5,
+	WLR_TABLET_TOOL_AXIS_ROTATION = 1 << 6,
+	WLR_TABLET_TOOL_AXIS_SLIDER = 1 << 7,
+	WLR_TABLET_TOOL_AXIS_WHEEL = 1 << 8,
 };
 
 struct wlr_event_tablet_tool_axis {