bug: fix position option in edit fx dialog

PR Summary 🚀

This detailed work delivers awesome improvements to our project's coding standards and usability. Here's a friendly summary of what's been done:

Updated and Enhanced Comments : We now have a consistently formatted set of comments in edit_formula_dialog.cpp and edit_formula_dialog.h. Big kudos to those who enjoy reading through the code - it's going to be a lot more straightforward now! 🤓
Switched to Single-line Comments : We have less clutter now and clearer code - we've done away with our old multi-line comment blocks and replaced them with sleek, single-line comments.
Split-up Function Descriptions : Awesome work, team! We now have neat segments in our files that highlight what each function is meant to do. This way, it's more intuitive to grasp the purpose of each function at a glance. 🚀

Harmonized Function Declarations : Further tidying up, we now have a unified layout for function declarations in the header file.
Enhanced Dialog Positioning : User satisfaction is on the up! There's been an update to the showEvent function in edit_formula_dialog.cpp to ensure the dialog box's position matches what the user prefers.

Copyright Year Update : We're keeping our files current, the copyright year in editlabeltemplate_dialog.cpp and editlabeltemplate_dialog.h has been updated to 2023.
Comment Style Shift : Lastly, we have neatened up the style of our comments in the same two files. The bulk comment blocks are out and dashed-line comments are in, boosting readability.

Let's keep up this fantastic work, team! 🎉