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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p23 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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

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