Fix install LG script

[jswiergo]

With cut-dirs=2 wget (v.1.15) downloads files into 'current' dir and script fails with:

Downloaded: 13 files, 3,5M in 1,9s (1,81 MB/s)
tar: link-grammar-5.*.tar.gz: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now
rm: cannot remove ‘link-grammar-5.*.tar.gz’: No such file or directory
./install-ubuntu-dependencies.sh: line 28: cd: link-grammar-5.*: No such file or directory
./install-ubuntu-dependencies.sh: line 29: ./configure: No such file or directory

[linas]

thanks!