[BUGFIX] Handle both t3:// and normal file names at once

[cweiske]

Fixup for "[FEATURE] Handle t3://file?uid=23 URLs in view helper"

The value of field

<flux:field type="input" config="{renderType: 'inputLink'}"/>

gets different values in TYPO3 v9 and v10:

• TYPO3 v9 stored the path to the filename, e.g. "fileadmin/user_upload/image.jpg"
• TYPO3 v10 stores a t3:// URL, e.g. "t3://file?uid=2342"

This patch automatically detects t3:// URLs in all image sources, regardless if $treatAsUid is given.

That way the view helpers can load an image regardless if they have been stored in TYPO3 v9 or v10:

<v:resource.file identifier="fileadmin/user_upload/image.jpg"/>
<v:resource.file identifier="t3://file?uid=2342"/>