Move #3305 test to main test area (to run against all JDKs)

Author: cowtowncoder

src/test-jdk14/java/com/fasterxml/jackson/databind/jdk15/CharSequenceDeser3305Test.java src/test/java/com/fasterxml/jackson/databind/deser/jdk/CharSequenceDeser3305Test.java

@@ -1,4 +1,4 @@
-package com.fasterxml.jackson.databind.jdk15;
+package com.fasterxml.jackson.databind.deser.jdk;
 
 import com.fasterxml.jackson.databind.BaseMapTest;
 import com.fasterxml.jackson.databind.ObjectMapper;