1261 label reopen context menu

[kevinjtwu]

Resolves #1261

For a label with context menu open, clicking on the label no longer closes the menu on mouse down and reopens it on mouse up.

Testing instructions

1. Navigate to Explore page
2. Place label and open context menu
3. Click on label with context menu open

Things to check before submitting the PR

• I've written a descriptive PR title.

[misaugstad]

The label now longer does a close and reopen, but it isn't closing at all! We still want it to close when you click on it, just not reopen again :)

[kevinjtwu]

The label now longer does a close and reopen, but it isn't closing at all! We still want it to close when you click on it, just not reopen again :)

Fixed! Label now closes on mouse down (and stays closed) when you click on the label instead of not closing at all.

[misaugstad]

Okay @kevinjtwu it looks like you accidentally deleted some code during a merge, but I believe I've got it all fixed up! I also did a small refactor from what you did, and deleted some of the code from your old commits. Just make sure to check Github's "Files changed" tab for your PR in the future to make sure that everything is cleaned up before I review.

And please take a look at how the code ended up looking and let me know if something looks wrong to you!