Bug 9770: test case for sorting of Dewey call numbers that contain prefixes

Bug 9770: test case for sorting of Dewey call numbers that contain prefixes

This adds a test for C4::ClassSortRoutine::Dewey to check that the
call number "JR DVD 800.1" sorts before "JR DVD 900"

To test:

[1] Apply just this patch.
[1] Run prove -v t/ClassSortRoutine_Dewey.t
[2] Test #7 should fail.

Signed-off-by: Jason Etheridge <jason@esilibrary.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes test plan and QA script.
Signed-off-by: Galen Charlton <gmc@esilibrary.com>