Fix hydrophobic

[jamesmkrieger]

fixes #2107

Now we get 57 hydrophobic interactions instead of 30 for this pdb and the pair of interest is included:

In [1]: from prody import *

In [2]: ag = parsePDB('DE_pd_15_0_dldesign_2_merged_af2pred.pdb')
@> 1637 atoms and 1 coordinate set(s) were parsed in 0.02s.

In [3]: x = calcHydrophobic(ag)
...
@>      VAL35    A       CG2_56914s  <--->      LEU54    A       CD1_856     3.5     8.4
...
@> Number of detected hydrophobic interactions: 57.

In [5]: interactions = Interactions()

In [6]: all_ints = interactions.calcProteinInteractions(ag)
...
@> Number of detected hydrophobic interactions: 57.
@> Lack of cysteines in the structure.
@> Number of detected disulfide bonds: 0.

In [7]: interactions.getInteractions(selection='resid 54', selection2='resid 35')
Out[7]: 
[[],
 [],
 [],
 [],
 [],
 [['VAL35', 'CG2_569', 'A', 'LEU54', 'CD1_856', 'A', 3.494, 8.4201]],
 []]