Remove unnecessary frame parameter.

Author: aardvark179

src/main/java/org/truffleruby/core/string/StringNodes.java

@@ -4718,7 +4718,7 @@ protected Object emptyString(DynamicObject string) {
     public abstract static class InternNode extends PrimitiveArrayArgumentsNode {
 
         @Specialization
-        public DynamicObject internString(VirtualFrame frame, DynamicObject string) {
+        public DynamicObject internString(DynamicObject string) {
             return getContext().getInternedString(string);
         }
     }