fix(results): fix copy markdown button

[soyacz]

fixed few issues in copy markdown support for results tables.

fixes: #577

[soyacz]

example markdown:

	P90 read [ms]	P99 read [ms]	Throughput read [op/s]	duration [HH:MM:SS]	start time	Overview	QA dashboard
Cycle #​1	$${\color{green}3.48}$$	$${\color{green}6.13}$$	41,240	$${\color{green}00:26:59}$$	07:34:27	view	view
Cycle #​2	$${\color{green}3.06}$$	$${\color{green}5.64}$$	41,240	$${\color{green}00:19:22}$$	08:02:27	view	view
Cycle #​3	$${\color{green}2.67}$$	$${\color{green}4.74}$$	41,240	$${\color{green}00:16:02}$$	08:22:37	view	view