OS X: Slightly improve pkgproj

It is still too much bound to Klaas' machine.

admin/osx/macosx.pkgproj

@@ -22,7 +22,7 @@
 									<key>GID</key>
 									<integer>80</integer>
 									<key>PATH</key>
-									<string>../install/owncloud.app</string>
+									<string>owncloud.app</string>
 									<key>PATH_TYPE</key>
 									<integer>3</integer>
 									<key>PERMISSIONS</key>
@@ -793,7 +793,7 @@
 													<key>GID</key>
 													<integer>0</integer>
 													<key>PATH</key>
-													<string>../install/Library/ScriptingAdditions/LiferayNativity.osax/Contents</string>
+													<string>Library/ScriptingAdditions/LiferayNativity.osax/Contents</string>
 													<key>PATH_TYPE</key>
 													<integer>3</integer>
 													<key>PERMISSIONS</key>