fix(ui): QInput shadow-text is showing when input is out of focus but hasError (#17155)

[IceIsFrozen]

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.

Other information:

Since errors were treated the same as focus for the highlighted class in use-field.js

+ (hasError.value === true || state.focused.value === true ? ' q-field--highlighted' : '')

made a simple change for the shadow-text/focused situation by splitting off for focused and checking if there's an error. If not, shadow-text acts normally.