feat(draims): fully functional clear key for editing frequency

Author: Misaka-L

src/Packages/com.yuxiaviation.v320neo.fdmi/Runtime/Avionics/Instruments/DRAIMS/Scripts/Components/RadioComponent.cs

@@ -135,7 +135,10 @@ public void _Input(DRAIMSKeyType keyType) {
                     charToInput = '9';
                     break;
                 case DRAIMSKeyType.Clear:
-                    _editingTextString = "";
+                    if (_editingTextString.Length != 0) {
+                        _editingTextString = _editingTextString.Remove(_editingTextString.Length - 1);
+                    }
+
                     UpdateEditing();
                     return;
             }