fix(accounts): complete client.name to client.account_name rename

The previous rename of the account option key left "client.name" in
accounts_set_client() and accounts_clear_client(), preventing the
option from being set/cleared. Update both functions to use the
correct "client.account_name" key.

Note: existing configurations with the old key will not be migrated
automatically; a migration fix will follow.

src/config/accounts.c

@@ -522,7 +522,7 @@ accounts_set_script_start(const char* const account_name, const char* const valu
 void
 accounts_set_client(const char* const account_name, const char* const value)
 {
-    _accounts_set_string_option(account_name, "client.name", value);
+    _accounts_set_string_option(account_name, "client.account_name", value);
 }
 
 void
@@ -576,7 +576,7 @@ accounts_clear_script_start(const char* const account_name)
 void
 accounts_clear_client(const char* const account_name)
 {
-    _accounts_clear_string_option(account_name, "client.name");
+    _accounts_clear_string_option(account_name, "client.account_name");
 }
 
 void