Pass the FileIndexerConfig as const to the individual indexers
Summary:
Also make maxUncommitedFiles() const, used in the FileContentIndexer.
No functional changes.
Test Plan: make
Reviewers: Baloo, Frameworks, poboiko, ngraham, dfaure, broulik
Reviewed By: broulik
Subscribers: kde-frameworks-devel
Tags: Frameworks, Baloo
Differential Revision: https://phabricator.kde.org/D16166