Remove names from quantile in summarize_long.

[krystian8207]

What changes are proposed in this pull request?

Closes #446

Which files are involved in this pull request and what changes were made?

Slight modification of summarize_long.numeric at R/utils_table.R file.

Did you include unit tests for the proposed change/bug fix (https://testthat.r-lib.org/)?

No, just customized the existing ones.

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