ISSUE-1500: Fix not found error on webtools

[BeMySlaveDarlin]

Hello!

• Type: bug fix
• Link to issue: Phalcon Devtools error: generate controllers, models and scaffold not working (404 not found page) #1500

In raising this pull request, I confirm the following (please check boxes):

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR

Small description of change:
Fixed not found error when webtools located at subfolder

Thanks

[codecov]

Codecov Report

Merging #1501 (e25b81a) into 4.0.x (b89d1d2) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

❗ Current head e25b81a differs from pull request most recent head 661ab4f. Consider uploading reports for the commit 661ab4f to get more accurate results

@@           Coverage Diff            @@
##           4.0.x   #1501      +/-   ##
========================================
- Coverage   3.16%   3.16%   -0.01%     
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  Files        111     111              
  Lines       5079    5082       +3     
========================================
  Hits         161     161              
- Misses      4918    4921       +3