remove "custom" from the styles path since the rule is already activated manually

vale/.vale.ini

@@ -4,7 +4,7 @@ MinAlertLevel = suggestion
 
 Vocab = geant-jargon
 
-Packages = proselint, Microsoft, custom
+Packages = proselint, Microsoft
 
 [*.md]
 BasedOnStyles = Vale, proselint, Microsoft
@@ -17,4 +17,4 @@ Microsoft.GeneralURL = NO
 proselint.Typography = warning
 ; Same applies for not using contractions, the custom package actually lints in the opposite direction
 Microsoft.Contractions = NO
-custom.contractions = YES
+custom.Contractions = YES