Fix Prusalink accept=".gcode"  

Fix Prusalink accept=".gcode"

Would it be possible to add all the valid file types to this HTML element? After I upgraded Slicer, it seems to default to .bgcode but when I try to upload to the MK4s the dialog looks only for .gcode files. The only other option is "all files" which can get messy if the directory has other file artifacts from the project, especially if it is a large project.

Screen shot of Windows Explorer file selector dialog for PrusaLink showing options limited to .gcode files or all files.

This is not a Windows file association thing, but is in the HTML hosted by the printer:

The accept= HTML element hosted on the MK4S is set to only accept .gcode files.

People using PrusaLink for older slicer or hardware still see their .gcode files and people using newer formats are no longer forced to change thr drop-down to see them. Win/win, yes?