Fix Exchange field not taking numbers (#1341)

lib/src/screens/exchange/exchange_page.dart

@@ -634,7 +634,7 @@ class ExchangePage extends BasePage {
               borderColor:
                   Theme.of(context).extension<ExchangePageTheme>()!.textFieldBorderTopPanelColor,
               currencyValueValidator: (value) {
-                return !exchangeViewModel.isFixedRateMode
+                return !exchangeViewModel.isFixedRateMode && value != S.of(context).all
                     ? AmountValidator(
                         isAutovalidate: true,
                         currency: exchangeViewModel.depositCurrency,

lib/src/screens/exchange/widgets/exchange_card.dart

@@ -272,9 +272,7 @@ class ExchangeCardState extends State<ExchangeCard> {
                                   color: Theme.of(context)
                                       .extension<ExchangePageTheme>()!
                                       .hintTextColor),
-                              validator: widget.hasAllAmount
-                                  ? widget.allAmountValidator
-                                  : _isAmountEditable
+                              validator: _isAmountEditable
                                       ? widget.currencyValueValidator
                                       : null),
                         ),