Tool settings for sequencer were not initialized, which caused crash when adding strips. There was fix for same issue in versioning rB0f81dafe6cec, but subversion was not bumped, so files with uninitialized tool settings may still exist. Add `SEQ_tool_settings_get()` accessor function that will initialize tool settings if they are missing. Change operator code to use `SEQ_tool_settings_fit_method_get()` function instead of accessing tool settings directly Reviewed By: campbellbarton Differential Revision: https://developer.blender.org/D11383