debian/rules: add stylesheet to .deb as per email reported bug (thanks)

git-svn-id: https://svn.code.sf.net/p/postfixadmin/code/trunk@296 a1433add-5e2c-0410-b055-b7f2511e0802

debian/rules

@@ -30,6 +30,7 @@ install: build
 	cp -a languages debian/postfixadmin/usr/share/postfixadmin
 	cp -a templates debian/postfixadmin/usr/share/postfixadmin
 	cp -a users debian/postfixadmin/usr/share/postfixadmin
+	cp stylesheet.css debian/postfixadmin/usr/share/postfixadmin
 	mkdir -p debian/postfixadmin/etc/apache2/conf.d
 	cp debian/apache-conf debian/postfixadmin/etc/apache2/conf.d/postfixadmin
 	find debian/postfixadmin -name .svn | xargs -r rm -r