fix: prevent InputNumber from press literal keys

Fixes primefaces#2631
and Keeps requirement from primefaces#2344

components/lib/inputnumber/InputNumber.js

@@ -534,14 +534,15 @@ export class InputNumber extends Component {
         }
 
         let code = event.which || event.keyCode;
+
+        if (code !== 13) event.preventDefault();
+
         let char = String.fromCharCode(code);
         const isDecimalSign = this.isDecimalSign(char);
         const isMinusSign = this.isMinusSign(char);
 
         if ((48 <= code && code <= 57) || isMinusSign || isDecimalSign) {
             this.insert(event, char, { isDecimalSign, isMinusSign });
-
-            event.preventDefault();
         }
     }