LibVT: Rename escape$A to CUU (Cursor Up)

Author: https://github.com/linusg 🔰
Commit: cc73284c64
Pull-request: https://github.com/SerenityOS/serenity/pull/1137
Reviewed-by: https://github.com/awesomekling

Libraries/LibVT/Terminal.h

@@ -148,7 +148,7 @@ private:
 
     void emit_string(const StringView&);
 
-    void escape$A(const ParamVector&);
+    void CUU(const ParamVector&);
     void escape$B(const ParamVector&);
     void escape$C(const ParamVector&);
     void escape$D(const ParamVector&);