mermaid simple line is going to be arrow line

[timothy-jeong]

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Describe the bug
the drawio blog post "mermaid-diagrams" said --- is connector style without arrow, and mermaid also implement that sepcification.
but when import the --- style to draw.io it convert to connector with arrow
is it bug?

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Arrange -> Insert -> Advanced -> mermaid'
2. Add Default example

graph TD;
  A---B;
  A---C;
  B---D;
  C---D;

3. now I can see graph with arrow connector

Expected behavior
graph without arrow connector

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io web app (https://app.diagrams.net/)

Desktop (please complete the following information):

• OS: [mac OS]
• Browser [chrome]
• Browser Version [133.0.6943.98]

I tested the problem in incognito/private mode with all browser extensions switched off, write "yes" below:

• yes