remove property declaration that is no longer needed

Author: smdn

src/Smdn.Reflection.ReverseGenerating.ListApi.MSBuild.Tasks/private/Smdn.Reflection.ReverseGenerating.ListApi.Core.csproj

@@ -12,11 +12,6 @@ SPDX-License-Identifier: MIT
   <PropertyGroup>
     <IsPackable>false</IsPackable>
     <VersionSuffix>private</VersionSuffix>
-    <!--
-      Later than version 1.4.5 of Smdn.MSBuild.ProjectAssets.Library, this will be set according to
-      the value of IsPackable, so this can be removed in the future.
-    -->
-    <APIListEnableGenerating>false</APIListEnableGenerating>
   </PropertyGroup>
 
   <!--