macOS: update qt5/6 logic parsing booleans

  In 2.20, parsing input strings as booleans is no longer standard
  behavior.  Update the macports and homebrew playbooks to convert
  any passed in qt5/6 flags to booleans.

Author: jhoyt4

roles/mythtv/tasks/homebrew_macosx.yml

@@ -21,7 +21,7 @@
 - name: homebrew_macosx | Set qt6 to true
   set_fact:
     qt6: true
-  when: qt5 is undefined
+  when: not qt5 | default(false) | bool
 
 - name: homebrew_macosx | Set cpanm_active to true
   set_fact:

roles/mythtv/tasks/macports_macosx.yml

@@ -18,7 +18,7 @@
 - name: macports_macosx | Set qt6 to true
   set_fact:
     qt6: true
-  when: qt5 is undefined
+  when: not qt5 | default(false) | bool
 
 - name: macports_macosx | Set venv_active to true
   set_fact:
@@ -62,12 +62,12 @@
 - name: macports_macosx | Set qt_version as qt5
   set_fact:
     qt_version: qt5
-  when: qt5 is defined and qt5
+  when: qt5 | default(false) | bool
 
 - name: macports_macosx | Set qt_version as qt6
   set_fact:
     qt_version: qt6
-  when: qt5 is undefined or not qt5
+  when: qt5 | default(true) | bool
 
 # get the python version specified by user in ansible_python_interpreter or defaulted by the interpreter
 - name: macports_macosx | Gather specific Python facts