Revert "[10.x] Feature. Currency Strict Mode"

This reverts commit 88823ce

Author: rez1dent3

config/config.php

@@ -78,16 +78,6 @@
         'seconds' => env('WALLET_LOCK_TTL', 1),
     ],
 
-    /**
-     * Feature flags for experiments.
-     */
-    'features' => [
-        /**
-         * Mode of strict work with currencies.
-         */
-        'currency_strict' => env('WALLET_CURRENCY_STRICT', false),
-    ],
-
     /**
      * Internal services that can be overloaded.
      */