[processing] restore Points in Polygons algorithm menu entry (follow up d4323ad)

(cherry picked from commit 8596265)

Author: alexbruy

python/plugins/processing/gui/menus.py

@@ -19,6 +19,7 @@
 analysisToolsMenu = vectorMenu + "/" + Processing.tr('&Analysis Tools')
 defaultMenuEntries.update({'qgis:distancematrix': analysisToolsMenu,
                            'qgis:sumlinelengths': analysisToolsMenu,
+                           'qgis:pointsinpolygon': analysisToolsMenu,
                            'qgis:countpointsinpolygon': analysisToolsMenu,
                            'qgis:listuniquevalues': analysisToolsMenu,
                            'qgis:basicstatisticsfornumericfields': analysisToolsMenu,