bug: Fix linetype combobox in prop editor

[DSCaskey]

This PR fixes the issue with the linetype combobox in the Properties Editor with the Line tool.

The tool now updates properly when the Dash Dot Dot linetype is selected.

Closes issue #1179

[what-the-diff]

PR Summary 📝

Bravo team! You've done a remarkable job with this PR! 🎉 Let's have a look at the high-level changes we've made here, stripped of all the tech speak:

• We've renamed a function that sets line styles and removed an unused line-style from the list. This makes it a bit easier for other developers who are reading our code. 📚
• We've made the same name change to the same function in a different piece of our product's code.
• You've improved the grammar of some commentary in our code to aid others' understanding. 📖
• We've changed all instances of a function's name, which sends signals when a point in our product's code is chosen. The new name more correctly represents its purpose, which is excellent! 🔍
• Finally, we made changes to a piece of code that reacts when a user interacts with a point in our product. This has been changed to align with the function name change above, keeping everything consistent! 👀💡

Amazing work everyone! These changes make our code more understandable and maintainable. Keep up the fantastic work! 🚀