fix(ui): QLayout containerized on iOS, only force fixed when reveal

[Evertvdw]

Adds a check to QFooter and QHeader that only forces a fixed footer/header when reveal is true.

What kind of change does this PR introduce?

• Bugfix
• Feature
• Documentation
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

The PR fulfills these requirements:

• It's submitted to the dev branch (or v[X] branch)
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• It's been tested on a Cordova (iOS, Android) app
• It's been tested on an Electron app
• Any necessary documentation has been added or updated in the docs or explained in the PR's description.

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to start a new feature discussion first and wait for approval before working on it)

Other information:

[github-actions]

UI Tests Results

0 tests   0 ✔️  0s ⏱️
0 suites  0 💤
2 files    0 ❌
2 errors

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Results for commit 0d9cf44.