fix style

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/common/DynamicObjectStorage.java

@@ -57,7 +57,6 @@
 import com.oracle.graal.python.nodes.object.BuiltinClassProfiles.IsBuiltinObjectProfile;
 import com.oracle.graal.python.nodes.util.CastToTruffleStringNode;
 import com.oracle.graal.python.runtime.sequence.storage.MroSequenceStorage;
-import com.oracle.graal.python.util.PythonUtils;
 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
 import com.oracle.truffle.api.dsl.Bind;
 import com.oracle.truffle.api.dsl.Cached;