fix(filepond): clear field class, fix issues with Bootstrap 4 (#58) #271

Job	Run time
packages_split (file, file)	8s
packages_split (file-association, file-association)	7s
packages_split (file-association-contracts, file-association-contracts)	11s
packages_split (file-association-entity, file-association-entity)	10s
packages_split (file-bundle, file-bundle)	11s
packages_split (file-contracts, file-contracts)	11s
packages_split (file-derivation, file-derivation)	12s
packages_split (file-filepond, file-filepond)	8s
packages_split (file-image, file-image)	12s
packages_split (file-metadata, file-metadata)	9s
packages_split (file-metadata-contracts, file-metadata-contracts)	12s
packages_split (file-null, file-null)	7s
packages_split (file-oneup-uploader-bridge, file-oneup-uploader-bridge)	6s
packages_split (file-server, file-server)	6s
packages_split (file-symfony-bridge, file-symfony-bridge)	7s
packages_split (file-zip, file-zip)	7s
	2m 24s

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