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/widgets/JavaSettingsWidget.cpp

@@ -245,7 +245,7 @@ void JavaSettingsWidget::memoryValueChanged(int)
     }
 }
 
-void JavaSettingsWidget::javaVersionSelected(BaseVersionPtr version)
+void JavaSettingsWidget::javaVersionSelected(BaseVersion::Ptr version)
 {
     auto java = std::dynamic_pointer_cast<JavaInstall>(version);
     if(!java)