Resuming an interpolation of a frame sequence input video doesn't restore FPS values properly, requiring user input

[kamild1996]

Scenario: Interpolation of a frame sequence input video is started, with input and output FPS given beforehand, and then stopped. Then, an attempt is made to resume interpolation by dragging the temp folder onto the program's window. What's expected to happen: Flowframes remembers the input and output FPS and allows the user to resume interpolation straight away. What happens instead: Flowframes asks the user to provide the input and output FPS again in order to be able to resume the interpolation, even though the settings.json file seems to store both the source FPS (as "inFps") as well as output FPS (as "outFps").