Fix project generator build on linux

The path to the projectGeneratorSettings.xml was wrong
Merge pull request #1818 from rogerzanoni/linuxbuild

Fix project generator build on linux
Revert "Fix project generator build on linux".

This reverts commit 8f12ae44e9973c9a1a19f5f9c2e63c0cc60b7d1f.
It was erroneously merged into master, the error was already fixed in develop.
Tentative particle commit in OSX... Transparency issues.
Merge remote-tracking branch 'origin/master' into custom0073
Merge branch 'custom0073' of https://github.com/funkmeisterb/openFrameworks into custom0073