changes: Fix typo

The actual change here was done with 821ab96402 ("hm: Re-add Hardware
Number 10104000 for HM-400") and again without mention in commit message
with afa96506a3 ("MI - alarms and control and other").  The changelog
was updated with the merge commit cfd73906e4 ("Merge branch
'development03' of https://github.com/rejoe2/ahoy into
rejoe2-development03") but attributing the wrong model.

src/CHANGES.md

@@ -1,7 +1,7 @@
 # Development Changes
 
 ## 0.7.59 - 2023-09-20
-* add another HM-600 hardware serial number #1169
+* re-add another HM-400 hardware serial number accidentally removed with `0.7.45` (#1169)
 * merge PR #1170
 * reduce last_success MQTT messages (#1124)
 * add re-request if inverter is known to be online and first try fails