Compose buffer spawns in new frame with pop-up-frames

### OS/platform Linux ### Emacs version and provenance Emacs 31.x openSUSE repos ### Emacs command emacs --fg-daemon ### Emacs frame type X ### Ement package version and provenance latest master, borg git ### Actions taken 1. set pop-up-frames to t 2. Enter a room, press C-c ' 3. See the extra frame that was created with the compose buffer opened twice ### Observed results An extra frame that was created with the compose buffer opened twice ### Expected results The compose buffer should be displayed in the same frame or if happens to open in a new frame then the frame should only contain one window. ### Backtrace ```elisp ``` ### Etc. _No response_