Fix/element check timeout

[TobiasAdler]

Description

If there were multiple UiElements with a @Check and a custom timeout for that check, only the first element was checked with that timeout, because after that, the threadLocalTimeout was set to the tt.element.timeout.seconds property, even though there should be no threadLocalTimeout.

Example:

Property set: tt.element.timeout.seconds=10

@Check(checkRule = CheckRule.IS_NOT_DISPLAYED, timeout = 1)
private final UiElement test = find(By.id("test"));
// -> check was done with a timeout of 1 seconds

@Check(checkRule = CheckRule.IS_NOT_DISPLAYED, timeout = 1)
private final UiElement test2 = find(By.id("test2"));
// -> check was done with a timeout of 10 seconds

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules