scrooge-sbt-plugin: publishMavenStyle true for SNAPSHOT publishing
scrooge-sbt-plugin: publishMavenStyle true for SNAPSHOT publishing

Summary: Problem

When publishing the snapshot version of the scrooge-sbt-plugin
to Sonatype's snapshot repository, `publishMavenStyle` should
be true.

Solution

Move the declaration where we set it to false to the block
that is only included when we are publishing a versioned
release to Bintray.

JIRA Issues: CSL-5859

Differential Revision: https://phabricator.twitter.biz/D130578

twitter/scrooge,twitter/scrooge,twitter/scrooge,twitter/scrooge