DEVELOPERS: remove Owen Walpole

His e-mail has been bouncing for quite a while:

<owen@walpole.dev>: connect to mail.walpole.dev[99.91.194.115]:25: Connection
    timed out

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

DEVELOPERS

@@ -1967,9 +1967,6 @@ F:	package/openjpeg/
 N:	Olivier Singla <olivier.singla@gmail.com>
 F:	package/shellinabox/
 
-N:	Owen Walpole <owen@walpole.dev>
-F:	package/parprouted/
-
 N:	Parnell Springmeyer <parnell@digitalmentat.com>
 F:	package/scrypt/