netconf-cli: The CLI is not called netconf-access

I noticed this when running `netconf-cli --version`. It looks like a
leftover from some earlier version. The cost of doing this change now is
that the history file won't be recognized, but I think that's still
reasonable.

Change-Id: I79b725999bad4ae7eb0ea4696739f3e9f87d72e5
Fixes: e2e15ee8e
diff --git a/src/cli.cpp b/src/cli.cpp
index a2c9cdc..271d9a5 100644
--- a/src/cli.cpp
+++ b/src/cli.cpp
@@ -63,7 +63,7 @@
 )";
 #include "cli-netconf.hpp"
 #include "netconf_access.hpp"
-#define PROGRAM_NAME "netconf-access"
+#define PROGRAM_NAME "netconf-cli"
 // FIXME: this should be replaced by C++20 std::jthread at some point
 struct PoorMansJThread {
     ~PoorMansJThread()