Remove unnecessary MSBuildAllProjects

Author: davidwengier

src/System.CommandLine.DragonFruit/targets/System.CommandLine.DragonFruit.targets

@@ -1,9 +1,5 @@
 <Project>
 
-  <PropertyGroup>
-    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
-  </PropertyGroup>
-
   <PropertyGroup Condition="'$(DisableAutoGeneratedMain)' != 'true'">
     <!-- The location of the generated program file. -->
     <_GeneratedEntryPointFile>$(IntermediateOutputPath)$(MSBuildProjectName).Program.g$(DefaultLanguageSourceExtension)</_GeneratedEntryPointFile>