.ignoreboards width fix

Boards on Ignore Boards Options page should be in 2 columns (.floatleft
and .floatright), but due to 90% width  that was not possible.

Signed-off-by: Hristo- Hristo-@users.noreply.github.com
Merge pull request #984 from Hristo-/release-2.1

.ignoreboards width fix