Documentation states that minimum of all reported coverage of all signals in a line should be taken.
Previous logic would break if there were any signals with zero coverage followed by signals with
nonzero coverage - a minimum from those nonzero toggle count would be taken, disregarding zero
coverage of previous signals.
Internal-tag: [#62193]
Signed-off-by: Krzysztof Obłonczek <koblonczek@antmicro.com>
