Bug 12600: remove duplicate use statement from code

Bug 12600: remove duplicate use statement from code

A use C4::Charset was added deep in the body of the code
we have already imported it at the top of the file
(the by convention normal place) As use is executed at compile time
specifying it in the code body does not serve a
useful purpose and detracts from the readability of an already
overly complex subroutine.
Remove the superfluous statement
also removed the tabs introduced to the surrounding lines
by the same commit

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Search still works, no errors.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>