pacman-helper quick_add: fix gpg verification in sanitize_db

In 94dde8c (pacman-helper quick_add: verify that the old/new Pacman
repos are in sync, 2025-02-16), I added a call to `call_gpg --verify`.
But that fails in the regular Git for Windows workflows because there,
`gpg.program=gnupg-with-gpgkey.sh` is configured and hence the
`call_gpg` function calls that script. And that script really only helps
with signing, not with verifying (but fails instead).

So let's call `gpg --verify` directly instead.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

pacman-helper.sh

@@ -164,7 +164,7 @@ sanitize_db () { # <file>...
 	then
 		for path in "$@"
 		do
-			if test -f "$path.sig" && call_gpg --verify "$path.sig"
+			if test -f "$path.sig" && gpg --verify "$path.sig"
 			then
 				continue
 			fi