tidy: Explicitly convert from boolean to AutoExpireType in playbackbo…

…x.cpp.

The clang-tidy "implicit boolean conversion" check pointed out one
place where a boolean was being converted to an integer, which on
investigation was then being cast to AutoExpireType.  Fix this to
explicitly convert from a boolean straight to AutoExpireType.

https://clang.llvm.org/extra/clang-tidy/checks/readability-implicit-bool-conversion.html

mythtv/programs/mythfrontend/playbackbox.cpp

@@ -4926,7 +4926,8 @@ void PlaybackBox::setRecGroup(QString newRecGroup)
 
     RecordingRule record;
     record.LoadTemplate("Default");
-    uint defaultAutoExpire = record.m_autoExpire;
+    AutoExpireType defaultAutoExpire =
+        record.m_autoExpire ? kNormalAutoExpire : kDisableAutoExpire;
 
     if (m_op_on_playlist)
     {
@@ -4940,7 +4941,7 @@ void PlaybackBox::setRecGroup(QString newRecGroup)
             if ((p->GetRecordingGroup() == "LiveTV") &&
                 (newRecGroup != "LiveTV"))
             {
-                p->SaveAutoExpire((AutoExpireType)defaultAutoExpire);
+                p->SaveAutoExpire(defaultAutoExpire);
             }
             else if ((p->GetRecordingGroup() != "LiveTV") &&
                      (newRecGroup == "LiveTV"))
@@ -4962,7 +4963,7 @@ void PlaybackBox::setRecGroup(QString newRecGroup)
         return;
 
     if ((p->GetRecordingGroup() == "LiveTV") && (newRecGroup != "LiveTV"))
-        p->SaveAutoExpire((AutoExpireType)defaultAutoExpire);
+        p->SaveAutoExpire(defaultAutoExpire);
     else if ((p->GetRecordingGroup() != "LiveTV") && (newRecGroup == "LiveTV"))
         p->SaveAutoExpire(kLiveTVAutoExpire);