bug: openROM=true overwrites persisted roms

[mithrendal]

when only floppy rom is missing and all three other roms are already choosen by the user and persisted in the localStorage.

the preconfig openROM=true

overwrites these user choosen roms when receiving MSG_ROM_MISSING from the wasm core

because it thinks there are no roms yet => and then openROMS will be loaded without question to the user

solution: only auto load openROMS when one of the three romtypes is missing: basic, kernal or charset

[mithrendal]

it turned out that it was an error in vc64_ui.js

in the following code the condition has to be

param_link != null && param_link.match(/[.](d64|g64)$/i) != null 

erroneous code ...

       var the_rom=loadStoredItem('vc1541_rom.bin'); 
        if (the_rom==null){
            var param_link=get_parameter_link();
            if( 
                param_link == null ||
                param_link.match(/[.](d64|g64)$/i) != null 
            )
            {
                all_fine=false;
            }            
            $("#rom_disk_drive").attr("src", "img/rom_empty.png");
            $("#button_delete_disk_drive_rom").hide();
        }
        else
        {
            $("#rom_disk_drive").attr("src", "img/rom.png");
            $("#button_delete_disk_drive_rom").show();
        }

and I was blaming the core 😢... I am so sorry 🙏🏻 ...

[mithrendal]

fixed