Button not disabled on add new bookmark modal by default

[srirambv]

Test plan

#9321 (comment)

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• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  Button not disabled on add new bookmark modal by default

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Windows 10 x64

• Brave Version (revision SHA):
  Brave 0.15.307
  rev 97fb76e
  Muon 3.0.200

• Steps to reproduce:

  1. Clean install 0.15.307 packaged build
  2. Click on bookmark toolbar and click on add bookmark folder
  3. Done button is not disabled by default. Clicking on it does nothing

• Actual result:
  Button not disabled on add new bookmark modal by default

• Expected result:
  Button should become active only when folder name is entered

• Will the steps above reproduce in a fresh profile? If not what other info can be added?
  Yes

• Is this an issue in the currently released version?
  No

• Can this issue be consistently reproduced?
  Yes

• Extra QA steps:
  1.
  2.
  3.

• Screenshot if needed:
  

• Any related issues:

[luixxiul]

Isn't it just the same issue as 'you cannot create empty title bookmark'?

[srirambv]

No. Adding a bookmark by removing the title sill adds the page title to it while you cannot create a empty bookmark folder. The button was disabled by default until the folder name was specified in 0.15.2

[luixxiul]

I see, the done button should be disabled at first until a character is input on the box.