Linux shell integration: Do not call sed from absolute path.

sed is in /bin/ rather than in /usr/bin on some systems, which
makes the scripts fail in the build environment. sed should be
in the PATH tough.

shell_integration/nautilus/createnemoplugin.sh

@@ -3,4 +3,4 @@
 # this script creates a plugin for nemo, just be replacing
 # all occurences of Nautilus with Nemo.
 
-/usr/bin/sed -i.org -e 's/autilus/emo/g' syncstate_nemo.py
+sed -i.org -e 's/autilus/emo/g' syncstate_nemo.py

shell_integration/nautilus/setappname.sh

@@ -3,4 +3,4 @@
 # this script replaces the line
 #  appname = 'ownCloud'
 # with the correct branding name in the syncstate.py script
-/usr/bin/sed -i.org -e 's/appname\s*=\s*'"'"'ownCloud'"'/appname = '$1'/" syncstate.py
+sed -i.org -e 's/appname\s*=\s*'"'"'ownCloud'"'/appname = '$1'/" syncstate.py