Update HasLabelStringMatcher.java

[torakiki]

Class name suggests this matcher should match only Labeled but the private nodeHasLabel also handles TextInputControl. If this is the intended behavior I think matchesSafetly should be changed to accept TextInputControl as well

[hastebrot]

Hey! Thanks for the PR.

Yes, there are some name inconsistencies in the Matchers, e. g. Commons#hasLabel() and Commons#hasText() both use HasLabelStringMatchers.

I tinkered a lot about how to improve the naming and started to refactor the Matchers. For example I think we should put Matchers related to the Labeled control into LabeledMatchers. Those related to TextInputControl into TextInputControlMatchers. Since it is very convenient to just use a single Matcher for both Labeled and TextInputControl there should be a NodeMatchers with hasText() that works for both of them.

Also these Matchers will be typed and fail with an error message if the wrong control that uses Node as superclass is tested.