Fix trailing slash removed while typing

[PikachuEXE]

Pull Request Type

• Bugfix
• Feature Implementation
• Documentation
• Other

Related issue

Better version of #3776
If this works can do the same for #8228
Closes #8228

Description

FT was updating value on typing (even with debounce)
So this PR updates on blur (should be typing/pasting ended) instead of input event

Screenshots

Test yourself to be accurate~

Testing

#3303 (comment)

Desktop

• OS:
• OS Version:
• FreeTube version:

Additional context

Draft coz dunno how to make it also update input value on blur (even it's already committed
Edit 1: Used setText but dunno if that's proper
Edit 2: It seems setText is needed due to if sanitized value is set already (no slash) and slash value is input, the stored value is NOT updated and thus won't make input component to refresh its displayed input data
If a new value is input then the input data is updated

[Shadorc]

In the Invidious API URL, if I type https:// and click elsewhere, it does nothing has expected, but if I add another / and click elsewhere it leads to https:, is it expected?

[PikachuEXE]

I have no idea what to do with those invalid values
The old logic does allow https:// for some reason but that could be due to handling typing issue
I am just fixing the slash removed during typing issue not the invalid value handling issue

[Shadorc]

Indeed, invalid values handling is probably more #3161 (comment) than #8228
It's cool that the commit is now done on blur, it prevents requesting invalid URLs while the user is typing!