install.yml deb block always remove venv if present

roles/kolibri/tasks/install.yml

@@ -78,6 +78,12 @@
       path: "{{ kolibri_exec_path }}"
     when: sym.stat.islnk is defined and sym.stat.islnk
   # end test
+
+  - name: Remove virtual environment {{ kolibri_venv_path }} if present
+    file:
+      path: "{{ kolibri_venv_path }}"
+      state: absent
+
 # https://kolibri.readthedocs.io/en/latest/install/ubuntu-debian.html claims:
 # "When you use the PPA installation method, upgrades to newer versions
 # will be automatic, provided there is internet access available."