fixed server breaking error in previous splash screen commit

servers/visual/rasterizer_dummy.cpp

@@ -1948,6 +1948,9 @@ bool RasterizerDummy::has_feature(VS::Features p_feature) const {
 
 }
 
+void RasterizerDummy::restore_framebuffer() {
+
+}
 
 RasterizerDummy::RasterizerDummy() {
 

servers/visual/rasterizer_dummy.h

@@ -779,6 +779,7 @@ public:
 
 	virtual bool has_feature(VS::Features p_feature) const;
 
+	virtual void restore_framebuffer();
 
 	RasterizerDummy();
 	virtual ~RasterizerDummy();