Ensure that sharedir paths always ends with a slash character.

The canonicalPath() function always strips the trailing slash
character. We need to add it back because of the way paths are built
later.

mythtv/libs/libmythbase/mythdirs.cpp

@@ -123,6 +123,7 @@ void InitializeMythDirs(void)
 
     if (sharedir.isEmpty())
         sharedir = confdir;
+    sharedir = QDir(sharedir).canonicalPath() + "/";
 
 #elif defined(Q_OS_ANDROID)
     if (installprefix.isEmpty())