Correct interface fields in FfprobeData

According to original library, the name of property should be streams, not stream.
https://github.com/fluent-ffmpeg/node-fluent-ffmpeg/blob/master/lib/ffprobe.js#L17

types/fluent-ffmpeg/index.d.ts

@@ -90,7 +90,7 @@ declare namespace Ffmpeg {
     type FormatsCallback = (err: Error, formats: Formats) => void;
 
     interface FfprobeData {
-        stream: any[];
+        streams: any[];
         format: any;
         chapters: any[];
     }