Check if relation before trying to input relation label

[thomtrp]

Bug introduced by #7363
Input value was not set during edition for field that were not relations

Fixed

[greptile-apps]

PR Summary

This pull request addresses a bug in the field editing functionality for non-relation fields in the data model settings.

• Added a condition in SettingsDataModelFieldIconLabelForm.tsx to check for relationType before updating the label
• Prevents unnecessary label updates for non-relation fields during editing
• Fixes an issue introduced by a previous pull request (Prefill Relation Fields with Initiating Object Icon and Name #7363)
• Ensures correct input value setting for fields that are not relations
• Improves the user experience when editing various field types in the data model settings

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