fix "partial match"

[SNAnalyst]

Every time I run remstats, I receive the warning of partial matches to factors.
This probably does not affect the accuracy of the function, but partial matches are less safe than exact matches. Please make sure to not use any partial matches in the code.

Here is an example:

stats_rem <- remstats::tomstats(~
....                                   inertia(scaling = "prop") # FrPSndSnd
....                                 , edgelist = reh)
Warning message:
In attr(ft, "factor") : partial match of 'factor' to 'factors'

[mlmeijerink]

Hi, this will be fixed in the next version!