Make sure output raw file is deleted at end of capture

Before it being closed on condition of the capture controller being garbage
collected, which we can't really count on. This was resulting in lots of
huge files being left in /tmp/eideticker between captures.

src/videocapture/videocapture/controller.py

@@ -419,3 +419,7 @@ class CaptureController(object):
 
         shutil.rmtree(self.outputdir)
         shutil.rmtree(rewritten_imagedir)
+        if self.output_raw_file:
+            # closing the file should delete it
+            self.output_raw_file.close()
+            self.output_raw_file = None