Fix paper typos in results

[kujason]

The results for bilateral blurring in Table III were entered incorrectly. They should be:

 Kernel                 | RMSE (mm) | MAE (mm) | Runtime (s)
Bilateral Blur          |   1503.67 |   310.59 | 0.011 
Median + Bilateral Blur |   1454.75 |   303.71 | 0.014