Fix set up sampling and analysis framework wizard relative import

[tmszi]

Reproduce:

1. In the Layer Manager go to menu Raster -> Landscape patch analysis -> Set up sampling and analysis framework

Error message appear in the Console tab:

Traceback (most recent call last):
  File "/usr/local/grass79/gui/wxpython/lmgr/frame.py", line
584, in OnRLiSetup

from rlisetup.frame import RLiSetupFrame
  File "/usr/local/grass79/gui/wxpython/rlisetup/frame.py",
line 14, in <module>

from rlisetup.wizard import RLIWizard
  File "/usr/local/grass79/gui/wxpython/rlisetup/wizard.py",
line 45, in <module>

from functions import SamplingType, sampleAreaVector,
convertFeature
ModuleNotFoundError
:
No module named 'functions'

[petrasovaa]

Thank you, merged to 78.