Minor tweak to logic for acceptStep() call closes #4041

I took a fresh look at this and realized that _picard_converged
would never be true here, so removed it from conditional check.
Merge pull request #4045 from bwspenc/picard_sync

Minor change to picard iteration logic
Merge commit 'cf5a8a33511d32dbd3156b62cd6d35562e3b573a'