git: installer: Fix source directory specification.

[Sascha Wildner]

commit 4086570b6fc8851d09613acab85061ee3f9d3f08
Author: Sascha Wildner <saw at online.de>
Date:   Sun Dec 11 18:59:28 2016 +0100

    installer: Fix source directory specification.
    
    It got broken in f7df6c8e7a.
    
    While here, pass -o to all backend invocations.

Summary of changes:
 usr.sbin/installer/installer/installer.sh | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/4086570b6fc8851d09613acab85061ee3f9d3f08


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