[2.2.0] Checkmk Werk 16890 created: check_ewon: ValueError (incomplete format)

Title: check_ewon: ValueError (incomplete format) Class: fix Compatible: compat Component: checks Date: 1722930770 Edition: cre Level: 1 Version: 2.2.0p33 Formatting a value with unit <code>%</code> would result in an invalid format-string making <code>check_ewon</code> crash with an exception <code>ValueError (incomplete format)</code>. This change makes <code>check_ewon</code> use f-formatting instead of <code>%</code>-formatting.