fix: don't use forward-declared Ptr types in meta/

This would cause ODR violations when those headers were included in
other places that also included stuff like "Version.h" (note the
"meta/Version.h"), which can cause problems, especially in LTO.

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/ui/dialogs/VersionSelectDialog.h

@@ -44,7 +44,7 @@ public:
 
     int exec() override;
 
-    BaseVersionPtr selectedVersion() const;
+    BaseVersion::Ptr selectedVersion() const;
 
     void setCurrentVersion(const QString & version);
     void setFuzzyFilter(BaseVersionList::ModelRoles role, QString filter);