Update VMR orchestrator property (#79517)

Author: mmitche

eng/Versions.props

@@ -147,7 +147,7 @@
     <UsingToolXUnit>false</UsingToolXUnit>
     <UseVSTestRunner>true</UseVSTestRunner>
     <!-- Prohibit the usage of .NET Standard 1.x dependencies. -->
-    <FlagNetStandard1XDependencies Condition="'$(DotNetBuildSourceOnly)' == 'true' and '$(DotNetBuildOrchestrator)' == 'true'">true</FlagNetStandard1XDependencies>
+    <FlagNetStandard1XDependencies Condition="'$(DotNetBuildSourceOnly)' == 'true' and '$(DotNetBuildFromVMR)' == 'true'">true</FlagNetStandard1XDependencies>
   </PropertyGroup>
   <PropertyGroup>
     <!--