uefisign.8: fix indent

The current version has every item description beginning on a new line;
not the intention.

usr.sbin/uefisign/uefisign.8

@@ -48,7 +48,7 @@ utility signs PE binary files using Authenticode scheme, as required by
 UEFI Secure Boot specification.
 Alternatively, it can be used to view and verify existing signatures.
 These options are available:
-.Bl -tag -width ".Fl l"
+.Bl -tag -width indent
 .It Fl V
 Determine whether the file is signed.
 Note that this does not verify the correctness of the signature;