[Android] fix bottom padding on contributor screen

[ked4ma]

Issue

• NO_ISSUE

Overview (Required)

• As following image(Before), bottom element of contributor will be buried behind the navbar.
  • with some device, snackbar is not displayed due to the navbar.
• Now, contributor screen is move into about screen
  • so I tried to change padding setting same as staff and sponsor screen to enable to show bottom element and snackbar.
• This doesn't have an issue ticket, so if it's AWFUL change, please close this PR 🙇

Links

• nothing

Screenshot (Optional if screenshot test is present or unrelated to UI)

device	Before	After
Pixel 6 api 30
Pixel Fold api 33

[takahirom]

Our policy for inset padding is this. Do you have any idea why it doesn't work?
#959 (comment)

[github-actions]

Test Results

211 tests   211 ✔️  8m 45s ⏱️
  11 suites      0 💤
  11 files        0 ❌

Results for commit 8a19b25.

[ked4ma]

@takahirom

Our policy for inset padding is this. Do you have any idea why it doesn't work? #959 (comment)

I this it's because ContributorScreen is not in the mainNestedGraph now.
In #959, contentPadding is passed from mainNestedGraph and had been using it for showing ContributorScreen.
But now, this is moved into the KaigiNavHost func.
And this func doesn't have padding information so ContributorScreen will use default PaddingValues .
By default, PaddingValues have 0dp for horizontal and vertical.
As a result, I think how to do padding was changed 🤔

[takahirom]

I've checked this approach is used in some screens! Thanks 🙏