Werk #11548: Swap perfometer definitions for fs_size/_usage and dedup_rate

In case a check provides metrics for deduplication rate ("dedup_rate") and filesystem usage ("fs_size" and "fs_usage") the Perf-O-Meter would display the (less important) deduplication rate. This change makes perfometer definition for "dedup_rate" appear after "fs_size" and "fs_usage".

To the list of all Werks