LibVT: Replace escape$h_l with SM (Set Mode) / RM (Reset Mode)

Author: https://github.com/linusg
Commit: fd8c250866
Pull-request: https://github.com/SerenityOS/serenity/pull/1137
Reviewed-by: https://github.com/awesomekling

Libraries/LibVT/Terminal.h

@@ -148,6 +148,8 @@ private:
 
     void emit_string(const StringView&);
 
+    void alter_mode(bool, bool, const ParamVector&);
+
     void CUU(const ParamVector&);
     void CUD(const ParamVector&);
     void CUF(const ParamVector&);
@@ -169,7 +171,8 @@ private:
     void escape$S(const ParamVector&);
     void escape$T(const ParamVector&);
     void escape$L(const ParamVector&);
-    void escape$h_l(bool, bool, const ParamVector&);
+    void RM(bool, const ParamVector&);
+    void SM(bool, const ParamVector&);
     void DA(const ParamVector&);
     void HVP(const ParamVector&);
     void NEL();