Trees#applyOverloaded: remove redundant filtering

Already taken care of by the `typeParamCount(tr) == targs.length`
filtering done above.

Author: smarter

compiler/src/dotty/tools/dotc/ast/Trees.scala

@@ -1532,14 +1532,13 @@ object Trees {
             case tp: PolyType => tp.paramInfos.length
             case _ => 0
           }
-          var allAlts = denot.alternatives
+          val allAlts = denot.alternatives
             .map(denot => TermRef(receiver.tpe, denot.symbol))
             .filter(tr => typeParamCount(tr) == targs.length)
             .filter { _.widen match {
               case MethodTpe(_, _, x: MethodType) => !x.isImplicitMethod
               case _ => true
             }}
-          if (targs.isEmpty) allAlts = allAlts.filterNot(_.widen.isInstanceOf[PolyType])
           val alternatives = ctx.typer.resolveOverloaded(allAlts, proto)
           assert(alternatives.size == 1,
             i"${if (alternatives.isEmpty) "no" else "multiple"} overloads available for " +