add logic to fix copy table for utf8

[nathanrpage97]

Missing the logic to enable ft_copy_table for utf8 tables.

[coveralls]

Pull Request Test Coverage Report for Build 790

• 28 of 30 (93.33%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 78.832%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/string_buffer.c	2	4	50.0%
<!--	Total:	28	30

Totals
Change from base Build 786:	0.07%
Covered Lines:	4819
Relevant Lines:	6113

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💛 - Coveralls