Drop scalate dependency from http example

Author: takezoe

2.8/http/scalatra-http-demo/build.sbt

@@ -7,13 +7,10 @@ val ScalatraVersion = "2.8.0"
 
 libraryDependencies ++= Seq(
   "org.scalatra"            %% "scalatra"          % ScalatraVersion,
-  "org.scalatra"            %% "scalatra-scalate"  % ScalatraVersion,
   "org.scalatra"            %% "scalatra-specs2"   % ScalatraVersion    % Test,
   "ch.qos.logback"          %  "logback-classic"   % "1.2.3"            % Provided,
   "org.eclipse.jetty"       %  "jetty-webapp"      % "9.4.35.v20201120" % Provided,
   "javax.servlet"           %  "javax.servlet-api" % "3.1.0"            % Provided
 )
 
-ThisBuild / evictionErrorLevel := Level.Warn
-
 enablePlugins(JettyPlugin)