LibVT: Rename escape$c to DA (Device Attributes)

Author: https://github.com/linusg
Commit: 2edd8e37ae
Pull-request: https://github.com/SerenityOS/serenity/pull/1137
Reviewed-by: https://github.com/awesomekling

Libraries/LibVT/Terminal.h

@@ -170,7 +170,7 @@ private:
     void escape$T(const ParamVector&);
     void escape$L(const ParamVector&);
     void escape$h_l(bool, bool, const ParamVector&);
-    void escape$c(const ParamVector&);
+    void DA(const ParamVector&);
     void escape$f(const ParamVector&);
     void NEL();
     void IND();