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

[//]: # (werk v2) # check_ewon: ValueError (incomplete format) key | value ---------- | --- date | 2024-08-06T07:52:50+00:00 version | 2.3.0p13 class | fix edition | cre component | checks level | 1 compatible | yes Formatting a value with unit `%` would result in an invalid format-string making `check_ewon` crash with an exception `ValueError (incomplete format)`. This change makes `check_ewon` use f-formatting instead of `%`-formatting.