Remove period from set variable names.

tasks/flatpaks.yml

@@ -13,8 +13,8 @@
 - name: Remove packages that may come with an OS but are being installed as Flatpak
   package: 
     name:
-    - "{{ package_name.firefox }}"
-    - "{{ package_name.thunderbird }}"
+    - "{{ firefox }}"
+    - "{{ thunderbird }}"
     state: absent
 
 - name: Install Discord