logictree: removed continuation backslashes from where they can be avoided
logictree: removed continuation backslashes from where they can be avoided

Former-commit-id: 76aeec2bebdfc68b5b058619d006ddeb5bf5b863 [formerly b2babb851ad070b7d1930c5a66fea9350645a8f6]
Former-commit-id: 79893b556408115c5297ce6e75d5613d73197765
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine