Update field_userenum.ts

[jp-96]

Data binding fails.
#9653

Console warning:
Cannot set the dropdown's value to an unavailable option. Block type: radioMessageCode, Field name: MEMBER, Value: add1

[jwunderl]

Thanks for the PR! Looks good to me; this also fixes microsoft/pxt-arcade#6037, I believe you re-filed it this morning after I moved it over to arcade last night (we typically track / prioritize bugs we can see in the editors themselves as they make it easier to repro / identify how many people are affected by them, so when possible it's best to file an issue in pxt-arcade or pxt-microbit even if it affects all editors.)

Here's a test project for anyone else who wants to review, swap around the order of red / yellow / blue in typescript then switch to blocks to induce the error: https://makecode.microbit.org/_gPUFdTT0s1zu

[jp-96]

we typically track / prioritize bugs we can see in the editors themselves as they make it easier to repro / identify how many people are affected by them, so when possible it's best to file an issue in pxt-arcade or pxt-microbit even if it affects all editors.

I understand,
Thank you.

[thsparks]

Thanks!