epm pack.d/generic-appimage.sh: fix for version started with v

pack.d/generic-appimage.sh

@@ -28,8 +28,9 @@ $TAR --appimage-extract >/dev/null || fatal
 
 # try separate VERSION from PRODUCT
 if [ -z "$VERSION" ] ; then
-    VERSION="$(echo "$PRODUCT" | grep -o -P "[-_.]([0-9v])([0-9])*([.]*[0-9])*" | head -n1 | sed -e 's|^[-_.a-zA-Z]||' -e 's|--|-|g' -e 's|^v\([0-9]\)|\1|' )"  #"
+    VERSION="$(echo "$PRODUCT" | grep -o -P "[-_.]([0-9v])([0-9])*([.]*[0-9])*" | head -n1 | sed -e 's|^[-_.a-zA-Z]||' -e 's|--|-|g' )"  #"
     [ -n "$VERSION" ] && PRODUCT="$(echo "$PRODUCT" | sed -e "s|[-_.]$VERSION.*||")"
+    [ -n "$VERSION" ] && VERSION="$(echo "$VERSION" | sed -e 's|^v||')"
     PRODUCT="${PRODUCT/-x86_64/}"
 fi