ValueLob is only constructed from PageStore

and even then, only in specific situations, so simplify accordingly

h2/src/main/org/h2/store/Data.java

@@ -621,7 +621,6 @@ public class Data {
             writeByte((byte) type);
             if (v instanceof ValueLob) {
                 ValueLob lob = (ValueLob) v;
-                lob.convertToFileIfRequired(handler);
                 byte[] small = lob.getSmall();
                 if (small == null) {
                     int t = -1;
@@ -1069,7 +1068,6 @@ public class Data {
             int len = 1;
             if (v instanceof ValueLob) {
                 ValueLob lob = (ValueLob) v;
-                lob.convertToFileIfRequired(handler);
                 byte[] small = lob.getSmall();
                 if (small == null) {
                     int t = -1;