Don't set --no-server for mill projects, is implied by -i, two cannot be used together

This reverts commit ef6a44a.

Author: WojciechMazur

community-build/src/scala/dotty/communitybuild/projects.scala

@@ -74,7 +74,7 @@ final case class MillCommunityProject(
   override val docCommand = null
     // uncomment once mill is released
     // if ignoreDocs then null else s"$baseCommand.docJar"
-  override val runCommandsArgs = List("-i", "-D", s"dottyVersion=$compilerVersion", "--no-server")
+  override val runCommandsArgs = List("-i", "-D", s"dottyVersion=$compilerVersion")
 
 final case class SbtCommunityProject(
     project: String,