tidy: Remove redundant initializers from constructor functions.

Remove any zero or false initializers, since that is the default value
for those types of variables.

This has the added advantage of making any non-default values stand
out, instead of being lost in a long list of default values.

See https://clang.llvm.org/extra/clang-tidy/checks/modernize/use-default-member-init.html

mythtv/programs/mythbackend/servicesv2/v2envInfo.h

@@ -37,10 +37,7 @@ class V2EnvInfo : public QObject
               m_LCALL       ( ""     ),
               m_LCCTYPE     ( ""     ),
               m_HOME        ( ""     ),
-              m_MYTHCONFDIR ( ""     ),
-              m_SchedulingEnabled (false),
-              m_IsDatabaseIgnored (false),
-              m_DBTimezoneSupport (false)
+              m_MYTHCONFDIR ( ""     )
         {
         }