Werk #13676: postgres_stat_database: Support DBs named with numbers only

Component	Checks & agents
Title	postgres_stat_database: Support DBs named with numbers only
Date	Mar 25, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

In case that PostgreSQL databases had names which contain only numbers, the discovery of the "PostgreSQL DB Statistics" previously failed.

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