[Fix] Updated sample subsetting and function parameters for dynamic expweighting function

[achen0222]

Summary

This change fixes:

1. a syntax error with subsetting the sample table (missing comma).

Reproduced error:

Error in `[.data.frame`(sampTab, sampTab$epoch == secondstate) : 
undefined columns selected

2. missing annotation_column parameter in the function signature, which is a required argument when passed into the IMCell_expweighted function.

Reproduced error:

Error in `[.data.frame`(sampTab, , dLevel) : undefined columns selected

Testing
Adding the comma and annotation column allows IMCell_epochnets_expweighted to run successfully.