[BUGFIX] EXT:form - handling of missing type attribute

[BUGFIX] EXT:form - handling of missing type attribute

Render default "type" attribute if not set by configuration.
Relates to the elements BUTTONTAG, INPUT and TEXTFIELD

Resolves: #71921
Releases: master, 7.6
Change-Id: If505ad401e36eb51dc4d81538b1fcca97ec982c8
Reviewed-on: https://review.typo3.org/45349
Tested-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>