fix #1061 size wrong between xid and branchId

[github-ygy]

Ⅰ. Describe what this PR did

size wrong between xid and branchId which will delete fail

Ⅱ. Does this pull request fix one issue?

fix #1061

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #1064 into develop will decrease coverage by <.01%.
The diff coverage is 60%.

@@              Coverage Diff              @@
##             develop    #1064      +/-   ##
=============================================
- Coverage      39.08%   39.07%   -0.01%     
  Complexity      1119     1119              
=============================================
  Files            221      221              
  Lines           8833     8832       -1     
  Branches        1130     1130              
=============================================
- Hits            3452     3451       -1     
  Misses          4940     4940              
  Partials         441      441

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/seata/rm/datasource/AsyncWorker.java	16.43% <0%> (ø)	4 <0> (ø)	⬇️
...va/io/seata/rm/datasource/undo/UndoLogManager.java	23.22% <100%> (-0.5%)	8 <0> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 111b6f8...c1b221e. Read the comment docs.

[xingfudeshi]

LGTM

[slievrly]

LGTM

[lixuzhou]

this also fixed issue #1065