update .$gt_calls code

[ddsjoberg]

Each {gtsummary} function that assists in creating/modifying tables added {gt} code to a list called gt_calls. This list contains one command per entry. For example:

> t = 
+   trial %>%
+   tbl_summary()
> t$gt_calls[1:2]
$gt
[1] "gt(data = x$table_body)"

$cols_label_label
[1] "cols_label(label = md('**Characteristic**'))"

Each command is stored as a string, but think this is not best practices. Probably, each of the commands should be stored as a quoted expression using quote() or rlang::expr()? Look into updating this.

[ddsjoberg]

updated to all calls are glue objects