d/rules: fix perms of several files in gestioip binary package

This address several lintian warnings:

W: gestioip: executable-not-elf-or-script usr/share/gestioip/errors/stylesheet.css
W: gestioip: executable-not-elf-or-script usr/share/gestioip/favicon.ico
W: gestioip: executable-not-elf-or-script usr/share/gestioip/errors/error403.html
W: gestioip: executable-not-elf-or-script usr/share/gestioip/install/vars_de
W: gestioip: executable-not-elf-or-script usr/share/gestioip/stylesheet_rtl.css
W: gestioip: executable-not-elf-or-script usr/share/gestioip/install/vars_es
W: gestioip: executable-not-elf-or-script usr/share/gestioip/install/stylesheet.css
W: gestioip: executable-not-elf-or-script usr/share/gestioip/modules/GestioIP.pm
W: gestioip: executable-not-elf-or-script usr/share/gestioip/install/favicon.ico
W: gestioip: executable-not-elf-or-script usr/share/gestioip/stylesheet.css
W: gestioip: executable-not-elf-or-script usr/share/gestioip/errors/stylesheet_rtl.css
W: gestioip: executable-not-elf-or-script usr/share/gestioip/errors/error401.html
W: gestioip: executable-not-elf-or-script usr/share/gestioip/errors/error500.html
W: gestioip: executable-not-elf-or-script usr/share/gestioip/errors/error404.html
W: gestioip: executable-not-elf-or-script usr/share/gestioip/install/vars_en

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