fix: Unable to Replace Default Input Label with Custom Label

[iamibrahimriaz]

PR Type

What kind of change does this PR introduce?

• Bugfix
• Security fix
• Improvement
• New Feature
• Refactoring (no functional changes, no api changes)
• Build related changes
• Text changes
• Other... Please describe:

Description

This PR updates the form builder widget label behavior so that the default label is only applied when the input loses focus (blur) and remains empty, instead of being applied immediately when the user clears the field.

Before:

• When a user cleared the label field, the default label was immediately reapplied, making it impossible to temporarily keep the label empty while typing a new one. - https://prnt.sc/Ji9lR2NOQDht

After:

• Users can clear the label and type freely without it being instantly replaced. - https://prnt.sc/oBtywsdb5Lck
• If the user leaves the label field empty and blurs the input, the default label is applied. - https://prnt.sc/KLdAYg8aMs2G

Any linked issues

Fixes #2615

Checklist

• My code follows the WordPress coding standards

[RabbiIslamRony]

Looks Good