Fix for #2649 (bugs in mex denier gadget)

[A-Lias]

Work done

Fixes a bug in mex denier gadget that prevents a mex build order exactly on top of a metal spot when the "insert command at beginning of queue" hotkey is held (spacebar).

• Fixes cmdID being overwritten
• Fixes typo with coordinate variables

Addresses Issue(s)

Issue #2649

Test steps

Issue order to build solar. Then, holding spacebar (or whatever hotkey you have bound to "insert command at beginning of queue"), issue an order to build a mex exactly on a metal spot. It should build without an error or warning.

Issue order to build solar. Then, holding spacebar (or whatever hotkey you have bound to "insert command at beginning of queue"), issue an order to build a mex off of a metal spot (so it snaps to the metal location). It should build on the metal spot without an error or warning.

Issue order to build solar. Then, holding shift (or whatever hotkey you have bound to "insert command at endof queue"), issue an order to build a mex exactly on a metal spot. It should build on the metal spot without an error or warning.

Issue order to build solar. Then, holding shift (or whatever hotkey you have bound to "insert command at endof queue"), issue an order to build a mex off of a metal spot (so it snaps to the metal location). It should build on the metal spot without an error or warning.

[thehobojoe]

Thank you for this! I unfortunately worked on the same problem before noticing your PR, this one should not only fix the obvious errors I made in mex denier (😬) but also improve meta handling in general. If you're willing to test that would be very helpful #2652

If you are on discord, having another person to help out and discuss these kinds of bugs with would be awesome 🙂

[A-Lias]

Great. I can't test your changes right now, but I'll try to test and get back to you soon.

Closing this PR for now.