Remove getClass() from _valueType argument for error reporting

[jschaf]

From ErrorProne:

src/main/java/com/fasterxml/jackson/databind/deser/std/FactoryBasedEnumDeserializer.java:184: error: [GetClassOnClass] Calling getClass() on an object of type Class returns the Class object for java.lang.Class; you probably meant to operate on the object directly
                wrapAndThrow(e, _valueClass.getClass(), prop.getName(), ctxt);
                                                    ^
    (see http://errorprone.info/bugpattern/GetClassOnClass)
  Did you mean 'wrapAndThrow(e, _valueClass, prop.getName(), ctxt);' or 'wrapAndThrow(e, Class.class, prop.getName(), ctxt);'?

[cowtowncoder]

Good catch, yes. I'll probably patch this manually in 2.9: thank you for submitting the fix!