Revert "config/debian/common: pass source overrides to apt-ftparchive sources"

This reverts commit f92f5bd3.

config/debian/common

@@ -53,7 +53,7 @@ function make_buildd_dir () {
 
         apt-ftparchive packages . $overridedir/override.sid.all3 >Packages
         gzip -9c --rsyncable <Packages >Packages.gz
-        apt-ftparchive sources . $overridedir/override.sid.all3.src >Sources
+        apt-ftparchive sources . $overridedir/override.sid.all3 >Sources
         gzip -9c --rsyncable <Sources >Sources.gz
 
         rm -f buildd/Release