fix: selecting the previous post leads to a negative page

[LIlGG]

What type of PR is this?

/kind bug
/area ui

What this PR does / why we need it:

修复当选中首个文章设置时，点击上一个还可以继续修改 page 的问题。

How to test it?

测试选中首个文章设置之后，点击上一个是否不再修改 page 值

Which issue(s) this PR fixes:

Fixes #5475

Does this PR introduce a user-facing change?

修复在文章列表设置中可以无限点击上一个的问题

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.4% Duplication on New Code

See analysis details on SonarCloud

[guqing]

good catch man

/lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.49%. Comparing base (5fdf6c0) to head (b7daef9).
Report is 82 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5594      +/-   ##
============================================
- Coverage     56.91%   56.49%   -0.43%     
- Complexity     3319     3320       +1     
============================================
  Files           587      595       +8     
  Lines         18968    19249     +281     
  Branches       1401     1357      -44     
============================================
+ Hits          10795    10874      +79     
- Misses         7594     7813     +219     
+ Partials        579      562      -17     

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[JohnNiang]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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• ui/OWNERS [JohnNiang]

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