Fix creation of some dojo dirs

Copy & paste error, before was accidently creating the source dir
of the dir copy in the next line, not the target dir

Possibly is not needed at all, given that it worked before, but then places
before also do the same, so let's be consistent, those calls do not hurt
Do not copy the whole dijit/themes dir, only what is needed (claro)
Merge pull request #698 from kossebau/onlyUseDojoClaroTheme

Only install Dojo's claro theme