Change VersionFeature80 calculation from 15 to 14

Author: marcpopMSFT

eng/Versions.props

@@ -35,7 +35,7 @@
     <VersionFeature50>17</VersionFeature50>
     <VersionFeature60>36</VersionFeature60>
     <VersionFeature70>20</VersionFeature70>
-    <VersionFeature80>$([MSBuild]::Add($(VersionFeature), 15))</VersionFeature80>
+    <VersionFeature80>$([MSBuild]::Add($(VersionFeature), 14))</VersionFeature80>
     <!-- Should be kept in sync with VersionFeature70. It should match the version of Microsoft.NET.ILLink.Tasks
          referenced by the same 7.0 SDK that references the 7.0.VersionFeature70 runtime pack. -->
     <_NET70ILLinkPackVersion>7.0.100-1.23211.1</_NET70ILLinkPackVersion>