Allow context bounds on type members in 3.6

It was forgotten before to enable this.

Author: odersky

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -4024,7 +4024,7 @@ object Parsers {
           case SEMI | NEWLINE | NEWLINES | COMMA | RBRACE | OUTDENT | EOF =>
             makeTypeDef(typeAndCtxBounds(tname))
           case _ if (staged & StageKind.QuotedPattern) != 0
-              || in.featureEnabled(Feature.modularity) && in.isColon =>
+              || sourceVersion.isAtLeast(`3.6`) && in.isColon =>
             makeTypeDef(typeAndCtxBounds(tname))
           case _ =>
             syntaxErrorOrIncomplete(ExpectedTypeBoundOrEquals(in.token))