Passphrase errors now trigger a Botan error changing the exit code

--- mtn-src/test/func/changing_passphrase_of_a_private_key/__driver__.lua	2026-08-05 21:18:01.996782227 +0200
+++ mtn-src/test/func/changing_passphrase_of_a_private_key/__driver__.lua	2026-08-05 21:18:06.973363633 +0200
@@ -7,10 +7,10 @@
 check(mtn("genkey", tkey), 0, false, false, string.rep(tkey.."\n", 2))
 
 -- fail to enter any passphrase
-check(mtn("passphrase", tkey), 1, false, false)
+check(mtn("passphrase", tkey), 3, false, false)
 
 -- fail to give correct old passphrase
-check(mtn("passphrase", tkey), 1, false, false, string.rep("bad\n", 3))
+check(mtn("passphrase", tkey), 3, false, false, string.rep("bad\n", 3))
 
 -- fail to repeat new password
 check(mtn("passphrase", tkey), 1, false, false,

--- mtn-src/test/func/disallowing_persistence_of_passphrase/__driver__.lua	2026-08-05 21:20:28.892980316 +0200
+++ mtn-src/test/func/disallowing_persistence_of_passphrase/__driver__.lua	2026-08-05 21:20:35.546373425 +0200
@@ -9,7 +9,7 @@
 
 check(mtn("--ssh-sign=no", "--branch=testbranch", "--rcfile=persist.lua",
           "commit", "--message=blah-blah"),
-      1, false, false, "tester@test.net\n")
+      3, false, false, "tester@test.net\n")
 
 check(mtn("--ssh-sign=no", "--branch=testbranch", "--rcfile=persist.lua",
           "commit", "--message=blah-blah"),