Bug 13763: (follow-up) Strip leading whitespace characters from input barcode

Bug 13763: (follow-up) Strip leading whitespace characters from input barcode

this makes the work with barcodes from input consistant on checking out,
     checking in and renewing

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 28ff4f6393e65ebfca60c05611fafc926f1fb239)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 2712e1ee55208332db4ec01310f58b8fa0b882c6)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>