[3.x] Fix conflicts between native Twill blocks and app/vendor blocks

[ifox]

twill.block_editor.directories contains both Twill and app directories by default. Without this fix, Twill's default text block is taking over in the form instead of the app's text block.

[what-the-diff]

• Fix typo in Capsule.php
• Add new constant to Block class for vendor blocks source type
• Remove duplicate TwillBlocks::DIRECTORY_TYPE_VENDOR and TwillBlocks::DIRECTORY_TYPE_APP constants, use 'source' instead of 'type' key in block directories array (TwillBlock)
• Use $data['source'] instead of $data['type'] when reading from directory (TwilServiceProvider)

[codecov]

Codecov Report

Base: 59.92% // Head: 59.92% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (9967a21) compared to base (aa6d0f2).
Patch coverage: 64.28% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##                3.x    #2135   +/-   ##
=========================================
  Coverage     59.92%   59.92%           
- Complexity     3898     3899    +1     
=========================================
  Files           303      303           
  Lines         15014    15018    +4     
=========================================
+ Hits           8997     9000    +3     
- Misses         6017     6018    +1     

Impacted Files	Coverage Δ
src/Services/Blocks/Block.php	79.67% <ø> (ø)
src/TwillServiceProvider.php	95.36% <ø> (-0.03%)	⬇️
src/Helpers/Capsule.php	67.85% <50.00%> (ø)
src/TwillBlocks.php	63.07% <66.66%> (+1.78%)	⬆️
src/Helpers/helpers.php	79.79% <0.00%> (-1.02%)	⬇️

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[haringsrob]

Weird behavior, when creating it showed the correct then on refresh the Twill's block.

Anyway tested and works perfectly!