js: fixed undesired minimum nodes alert blink
js: fixed undesired minimum nodes alert blink

Moved the calls of `toggleMinimumNodesAlert` and
`handleBootstrapErrors` to be done after the checkbox
changes to `true` instead of by any change (false/true).

With this change there will be no middle state that cause
the alert when `toggleMinimumNodesAlert` is called.

Fixes bsc#1066371

ereslibre/velum,MaximilianMeister/velum,ereslibre/velum,vitoravelino/velum,ereslibre/velum,MaximilianMeister/velum,MaximilianMeister/velum,MaximilianMeister/velum,vitoravelino/velum,vitoravelino/velum,kubic-project/velum,kubic-project/velum,kubic-project/velum,kubic-project/velum,ereslibre/velum,vitoravelino/velum