Minor fix: Gerber X2 attribute: remove one attribute (TF .GerberVersion, now...

Minor fix: Gerber X2 attribute: remove one attribute (TF .GerberVersion, now no more in use) I added in my recent changes relative to the new J5 gerber version attributes.

pcbnew/pcbplot.cpp

@@ -211,13 +211,6 @@ void AddGerberX2Attribute( PLOTTER * aPlotter,
 {
     wxString text;
 
-#ifdef USE_J5_ATTR
-    text = wxT("%TF.GerberVersion,J5*%");
-#else
-    text = wxT("%TF.GerberVersion,J4*%");
-#endif
-    aPlotter->AddLineToHeader( text );
-
 #ifdef USE_J5_ATTR
     // Creates the TF,.GenerationSoftware. Format is:
     // %TF,.GenerationSoftware,<vendor>,<application name>[,<application version>]*%