Fix formatting error in example problem beam_3d_exp_gsf.tpd

[jestuber]

Extra space in front of line 25 was causing example problem to not work. The code would read in the line as input, then fail with the following:

Traceback (most recent call last):
File "optimise.py", line 21, in
t.load_tpd_file(argv[1])
File "/usr/local/lib/python2.7/dist-packages/topy/topology.py", line 82, in load_tpd_file
self.topydict = tpd_file2dict(fname)
File "/usr/local/lib/python2.7/dist-packages/topy/parser.py", line 89, in tpd_file2dict
d = _parsev2007file(s)
File "/usr/local/lib/python2.7/dist-packages/topy/parser.py", line 123, in _parsev2007file
d[pair[0].strip()] = pair[1].strip()
IndexError: list index out of range

Removing the space allows the example to run

[williamhunter]

Thanks.