Remove assert in the tablet support code

It seems the number of table axes mappings can be arbitrary in the
driver. That is it can be smaller, the same or bigger than the number
of known axes types.

BUG:338778

krita/ui/input/wintab/kis_tablet_support.h

@@ -123,7 +123,8 @@ struct QTabletDeviceData
         void tryFetchAxesMapping(XDevice *dev);
 
         void setAxesMap(const QVector<AxesIndexes> &axesMap) {
-            KIS_ASSERT_RECOVER_RETURN(axesMap.size() >= NAxes);
+            // the size of \p axesMap can be smaller/equal/bigger
+            // than m_axes_data. Everything depends on the driver
 
             m_x11_to_local_axis_mapping = axesMap;
         }