container: src: finance: change visidata default dir

The container environment's $DOCKER_FINANCE_CONTAINER_CONF is
bind-mounted and, by default, points to ~/.config/docker-finance.d

The parent dir (~/.config) is subsequently owned by root (Docker-ism).
Ergo, with visidata v3.2, visidata cannot create its default dir:

    "PermissionError: [Errno 13] Permission denied: for visidata config"

This commit fixes that by setting visidata's default dir to use the
calling profile's docker-finance.d (where profile customization occurs).

Also included is some related refactoring.

container/src/finance/lib/lib_finance.bash

@@ -2,7 +2,7 @@
 
 # docker-finance | modern accounting for the power-user
 #
-# Copyright (C) 2021-2024 Aaron Fiore (Founder, Evergreen Crypto LLC)
+# Copyright (C) 2021-2025 Aaron Fiore (Founder, Evergreen Crypto LLC)
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -81,6 +81,7 @@ function lib_finance::finance()
   declare -grx global_conf_hledger="${global_child_profile_flow}/docker-finance.d/hledger/hledger.conf"
   declare -grx global_conf_meta="${global_child_profile_flow}/docker-finance.d/meta/meta.csv"
   declare -grx global_conf_subscript="${global_child_profile_flow}/docker-finance.d/shell/subscript.bash"
+  declare -grx global_conf_visidata="${global_child_profile_flow}/docker-finance.d/visidata" # dir for config/addons
 
   # Implementation "libraries" (requires previously set globals)
   source "${DOCKER_FINANCE_CONTAINER_REPO}/src/finance/lib/internal/lib_edit.bash" || exit 1