Revert "macOS codesign: Also use the org.videolan. prefix in gk mode"

This reverts commit 2e2a1b3437.

This seems to be a problem by sub-signing the Sparkle files and the VLC
include headers

extras/package/macosx/codesign.sh

@@ -85,7 +85,7 @@ sign()
     IDENTIFIER="$2"
     if [ -z "$IDENTIFIER" ]; then
         filename=$(basename "$1")
-        IDENTIFIER="org.videolan.${filename%.*}"
+        IDENTIFIER="${filename%.*}"
     fi
 
     # info "Signing file $1 with identifier $IDENTIFIER"