Draft: Fix bug that was causing floating dialogs states to save incorrectly

• Fixes #3027 (closed) Split out to separate MR
• Fixes bug where dialogs sharing the same state wouldn't save their states properly to dialog-state-ex.ini when exiting
• Refactor code by renaming a function and formatting it with the help of clang-format
• Since floating dialog states are almost always saved and read in a sorted fashion, we can use std::map::emplace_hint to make smarter insertions.