Allow the instconf form element to also use the ANY wildcard help file

Bug #1308479

Allow the same license, licensor, licensorurl help files to be accessible
in block instance config form for both the 'license' section and the
attachments 'license' section

Change-Id: I20dc64c6d4c3cf25138c46348c2d8e5bf7a8fc94
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>