debian packaging: avoid conflicting files (followup add1a92, refs #20856, fixes #20894)

Author: jef-n

debian/python-qgis.install.in

@@ -4,6 +4,5 @@ usr/lib/python*/*-packages/qgis/core/*
 usr/lib/python*/*-packages/qgis/gui/*
 usr/lib/python*/*-packages/qgis/analysis/*
 usr/lib/python*/*-packages/qgis/PyQt/*
-usr/lib/python*/*-packages/qgis/testing/*
 usr/lib/python*/*-packages/qgis/server/*
 #sid buster bionic cosmic#usr/lib/python*/*-packages/qgis/3d/*