[REF] point_of_sale: replace formatFixed with formatCurrency no symbol

Part-of: odoo/odoo#120317

addons/point_of_sale/static/src/app/number_buffer_service.js

@@ -286,7 +286,11 @@ class NumberBuffer extends EventBus {
             // when input is like '+10', '+50', etc
             const inputValue = oParseFloat(input.slice(1));
             const currentBufferValue = this.state.buffer ? oParseFloat(this.state.buffer) : 0;
-            this.state.buffer = this.component.env.pos.formatFixed(inputValue + currentBufferValue);
+            // FIXME POSREF: the `buffer` shouldn't be dependent on the currency.
+            this.state.buffer = this.component.env.utils.formatCurrency(
+                inputValue + currentBufferValue,
+                false
+            );
         } else if (!isNaN(parseInt(input, 10))) {
             if (this.state.toStartOver) {
                 // when we want to erase the current buffer for a new value

addons/point_of_sale/static/src/js/models.js

@@ -1508,16 +1508,6 @@ export class PosGlobalState extends PosModel {
         return parseFloat(round_di(value, decimals).toFixed(decimals));
     }
 
-    /**
-     * (value = 1.0000, decimals = 2) => '1'
-     * (value = 1.1234, decimals = 2) => '1.12'
-     * @param {number} value amount to format
-     */
-    formatFixed(value) {
-        const currency = this.currency || { decimal_places: 2 };
-        return `${Number(value.toFixed(currency.decimal_places || 0))}`;
-    }
-
     disallowLineQuantityChange() {
         return false;
     }