refactored aac aproximate_frame_count() method. It had some issues which causes panic. Should fix cases from https://github.com/qarmin/Automated-Fuzzer/actions/runs/12516290494 (REPORTS___SYMPHONIA*)

1. renamed total_len to remaining_len because this is not the length of the whole file, but it was considered such in some places.
2. first sample point to start from the beginning, file can contain a single frame
3. check step to be bigger than 0 to avoid panic
4. skip the rest of the frame after the header is read to avoid looking for sync word in the audio data
5. break if reading 100 frames overlap next sample point

I haven't tested on VBR aac to observe any improvements, It was #196 (comment) approximate method is not perfect there