roles: strict truthy values

According to Ansible we can use yes, true, True, "or any quoted st-
ring" for a boolean true, but ansible-lint wants us to use either
true or false.

See: https://chronicler.tech/red-hat-ansible-yes-no-and/

roles/common/tasks/packages_Ubuntu.yml

@@ -38,17 +38,17 @@
     - name: Remove lxd snap
       community.general.snap: name=lxd state=absent
       when: ansible_distribution_version is version('20.04', '==')
-      ignore_errors: yes
+      ignore_errors: true
 
     - name: Remove core18 snap
       community.general.snap: name=core18 state=absent
       when: ansible_distribution_version is version('20.04', '==')
-      ignore_errors: yes
+      ignore_errors: true
 
     - name: Remove snapd snap
       community.general.snap: name=snapd state=absent
       when: ansible_distribution_version is version('20.04', '==')
-      ignore_errors: yes
+      ignore_errors: true
 
     - name: Set fact for packages to remove (Ubuntu <= 18.04)
       ansible.builtin.set_fact:
@@ -79,7 +79,7 @@
       when: ansible_distribution_version is version('20.04', '==')
 
     - name: Remove packages
-      ansible.builtin.apt: name={{ ubuntu_annoying_packages }} state=absent purge=yes
+      ansible.builtin.apt: name={{ ubuntu_annoying_packages }} state=absent purge=true
 
     - name: Disable annoying Canonical spam in MOTD
       ansible.builtin.file: path={{ item }} mode=0644 state=absent
@@ -89,7 +89,7 @@
         - /etc/update-motd.d/50-motd-news # Ubuntu 18.04+
         - /etc/update-motd.d/80-esm # Ubuntu 18.04+
         - /etc/update-motd.d/80-livepatch # Ubuntu 18.04+
-      ignore_errors: yes
+      ignore_errors: true
 
     - name: Disable annoying Canonical spam in MOTD
       ansible.builtin.systemd: name={{ item }} state=stopped enabled=no