Fix for FasterXML#1154

Partially roll back to pre-FasterXML#1111 behavior.
We just make sure that the STRING shape is chosen when Shape.ANY (the default) is set on the annotation, but some other annotation attribute was also set (pattern, locale or timezone).
This way of fixing the issue has the added benefit of respecting the user config regarding the default serialization of dates when @jsonformat(shape = Shape.ANY) is set on a property.

src/main/java/com/fasterxml/jackson/databind/ser/std/DateTimeSerializerBase.java

@@ -59,14 +59,15 @@ public JsonSerializer<?> createContextual(SerializerProvider serializers,
                     return withFormat(Boolean.TRUE, null);
                 }
 
-                if (format.getShape() == JsonFormat.Shape.STRING) {
+                if (format.getShape() == JsonFormat.Shape.STRING || format.hasPattern()
+                                || format.hasLocale() || format.hasTimeZone()) {
                     TimeZone tz = format.getTimeZone();
                     final String pattern = format.hasPattern()
-                                           ? format.getPattern()
-                                           : StdDateFormat.DATE_FORMAT_STR_ISO8601;
+                                    ? format.getPattern()
+                                    : StdDateFormat.DATE_FORMAT_STR_ISO8601;
                     final Locale loc = format.hasLocale()
-                                       ? format.getLocale()
-                                       : serializers.getLocale();
+                                    ? format.getLocale()
+                                    : serializers.getLocale();
                     SimpleDateFormat df = new SimpleDateFormat(pattern, loc);
                     if (tz == null) {
                         tz = serializers.getTimeZone();