Bug 11231: remove reference to ambiguous notes column from two hold request reports

The 'notes' column has been removed from the pending holds and hold
ratios reports as they were not displaying in the first place.

1.apply patch
2.verify that both reports work

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>