change "v.digit" to "g.gui.vdigit" in error message

[hellik]

related to ​dev ML

"Vector digitizer not available                                                  
Reason: cannot import name GV_LINES                                             
Note that the wxGUI's vector digitizer is currently disabled
(hopefully this will be fixed soon). Please keep an eye out
for updated versions of GRASS. In the meantime you can use
"v.digit" from the Develop Vector menu."

v.digit was changed to g.gui.vdigit; the error/warning message should reflect this

[annakrat]

If GUI digitizer doesn't work, g.gui.vdigit won't work either (it's the same thing), so there is no reason to recommend it. Perhaps we could recommend v.edit?

[hellik]

Replying to annakrat:

If GUI digitizer doesn't work, g.gui.vdigit won't work either (it's the same thing), so there is no reason to recommend it. Perhaps we could recommend v.edit?

yes, just seen that g.gui.vdigit also doesn't work.

so warning message should be changed, v.edit may be an alternative (though not very interactive user friendly).

[annakrat]

Done in r71246 and r71247.