Fix resolve filters chain

[darksidecat]

Description

Bound filter resolving does not require children routers

Type of change

Please delete options that are not relevant.

• Documentation (typos, code examples or any documentation update)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Run local tests

Test Configuration:

• Operating System: Win 10
• Python version: 3.9.2

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #736 (2b7f054) into dev-3.x (42cba89) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           dev-3.x      #736   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          272       272           
  Lines         7105      7108    +3     
=========================================
+ Hits          7105      7108    +3     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiogram/dispatcher/router.py	100.00% <ø> (ø)
aiogram/dispatcher/event/telegram.py	100.00% <100.00%> (ø)
aiogram/dispatcher/dispatcher.py	100.00% <0.00%> (ø)
aiogram/dispatcher/event/handler.py	100.00% <0.00%> (ø)
aiogram/dispatcher/filters/command.py	100.00% <0.00%> (ø)