d/rules: fix permission of some dirs

This patch solves several lintian warnings:

W: gestioip: non-standard-dir-perm usr/share/gestioip/imagenes/OS/ 0655 != 0755
W: gestioip: non-standard-dir-perm usr/share/gestioip/imagenes/apps/ 0655 != 0755
W: gestioip: non-standard-dir-perm usr/share/gestioip/imagenes/style/ 0655 != 0755
W: gestioip: non-standard-dir-perm usr/share/gestioip/imagenes/vendors/ 0655 != 0755

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>