revert CpiGuard reversion

[2501babe]

to save you the pain of actually reading any of this:

hana@laptop:cli$ git show master
commit e69c7706fb5b1c651b086853d5cb1d688958083a (upstream/master, upstream/HEAD, master)
Author: J <[email protected]>
Date:   Wed Oct 26 05:41:37 2022 +0800

    `spl-token` cli - use default config file (#3738)
    
    * add missing load from CONFIG_FILE default path

diff --git a/token/cli/src/config.rs b/token/cli/src/config.rs
index ef6ee30f..b6cfff1c 100644
--- a/token/cli/src/config.rs
+++ b/token/cli/src/config.rs
@@ -112,6 +112,8 @@ impl<'a> Config<'a> {
                 eprintln!("error: Could not find config file `{}`", config_file);
                 exit(1);
             })
+        } else if let Some(config_file) = &*solana_cli_config::CONFIG_FILE {
+            solana_cli_config::Config::load(config_file).unwrap_or_default()
         } else {
             solana_cli_config::Config::default()
         };

hana@laptop:cli$ git diff 20221013_cpiguard..20221025_cpiguard_antireunvert
diff --git a/token/cli/src/config.rs b/token/cli/src/config.rs
index ef6ee30f..b6cfff1c 100644
--- a/token/cli/src/config.rs
+++ b/token/cli/src/config.rs
@@ -112,6 +112,8 @@ impl<'a> Config<'a> {
                 eprintln!("error: Could not find config file `{}`", config_file);
                 exit(1);
             })
+        } else if let Some(config_file) = &*solana_cli_config::CONFIG_FILE {
+            solana_cli_config::Config::load(config_file).unwrap_or_default()
         } else {
             solana_cli_config::Config::default()
         };

[joncinque]

Thanks for doing this!