qtvcp -Qt5_graphics: issue 2753; preview wrongly uses INI startup code

instead of current active gcode.

see github issue 2753

Author: c-morley

src/emc/usr_intf/gremlin/qt5_graphics.py

@@ -388,7 +388,7 @@ def load(self,filename = None):
                 shutil.copy(parameter, temp_parameter)
             canon.parameter_file = temp_parameter
             unitcode = "G%d" % (20 + (s.linear_units == 1))
-            initcode = self.inifile.find("RS274NGC", "RS274NGC_STARTUP_CODE") or ""
+            initcode = ""
             result, seq = self.load_preview(filename, canon, unitcode, initcode)
             if result > gcode.MIN_ERROR:
                 self.report_gcode_error(result, seq, filename)