tbl_survfit_times set conf.type = "plain" as default

[reesnj]

Feature description

The confidence intervals for the event free rates produced by tbl_survfit_times uses conf.type = "log" as default. However, in NEST 1.0, we used surv_timepoint which used conf.type = "plain" as default.

The GDSR indicates that we should use linear as the default which corresponds to conf.type = "plain" (i.e; NEST 1.0 was correct).

In the TTET01 template I am responsible for, I have directly overwritten the default behavior in the template. However, I feel like the tbl_survfit_times function itself should be updated to make this the default.

The same issue also applies for the tbl_survfit_quantiles() function.

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