fix(cli): fix could not find any [routes] variable

[cipchk]

• close Could not find any [routes] variable in path '/src/app/routes/routes.ts' ng-alain#2517

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[cipchk]

Preview is ready!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.58%. Comparing base (67291ce) to head (140748a).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1832      +/-   ##
==========================================
+ Coverage   94.89%   95.58%   +0.69%     
==========================================
  Files         315      315              
  Lines        8912     8931      +19     
  Branches     1688     1699      +11     
==========================================
+ Hits         8457     8537      +80     
- Misses        381      382       +1     
+ Partials       74       12      -62     

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