Options Creator: Fix handling of options with random default

[duckboycool]

What is this fixing or adding?

Currently, an option which defaults to random will be shown as such in the Options Creator, but if it is unselected, its underlying value remains as random (and it will be exported as such) even though the displayed value is now something else. Example: https://discord.com/channels/731205301247803413/1522543645826355271
This sets the value upon initialization to the same thing that is being displayed so there isn't a mismatch.

Also while doing this, I noticed that the random button can appear (and seemingly just error if used) for option types the creator can't actually display, that it's apparently possible to click on the edge of a disabled Choice option and set it to something else while randomized (which also causes a mismatch between display and actual value), and that on a TextChoice the "Custom" text doesn't show unless you press enter, whereas the value updates upon any text change, so I changed these things as well.

How was this tested?

Exporting options from ALttP and The Witness, which have default-random Choices/Ranges, and also testing changing other option types to default to random to make sure they also work.

If this makes graphical changes, please attach screenshots.

🎲

[duckboycool]

TextChoices here keep the random text in the textbox, which I guess is fine but doesn't seem super preferable. I tried to change this and also make it so picking an option from the dropdown clears the textbox, but this kind of brings madness since it doesn't seem like there's a way in kivy to distinguish the user changing the text compared to modifying .text manually in the program. Gotta love kivy.

This also does technically change how the exported options may look in the yaml compared to selecting them normally, but it should at least give a correct way of representing the value.