Remove useful check from tryObjectEncoding().

We are sure the string is large, since when the sds optimization branch
is entered it means that it was not possible to encode it as EMBSTR for
size concerns.

src/object.c

@@ -372,8 +372,7 @@ robj *tryObjectEncoding(robj *o) {
              * We do that only for relatively large strings as this branch
              * is only entered if the length of the string is greater than
              * REDIS_ENCODING_EMBSTR_SIZE_LIMIT. */
-            if (len > 64 &&
-                o->encoding == REDIS_ENCODING_RAW &&
+            if (o->encoding == REDIS_ENCODING_RAW &&
                 sdsavail(s) > len/10)
             {
                 o->ptr = sdsRemoveFreeSpace(o->ptr);