machines: Don't reset the OS to unspecified if OS autodetection failed

If the user manually inserted the OS but autodetection failed let's trust him
instead of overwritting it with the default value.

Closes #12263

pkg/machines/components/create-vm-dialog/createVmDialog.jsx

@@ -526,13 +526,7 @@ class CreateVmModal extends React.Component {
                                         os: osEntry[0].shortId
                                     });
                                 }
-                            }, ex => {
-                                console.log("osinfo-detect command failed: ", ex.message);
-                                this.setState({
-                                    vendor: NOT_SPECIFIED,
-                                    os: OTHER_OS_SHORT_ID,
-                                });
-                            });
+                            }, ex => console.log("osinfo-detect command failed: ", ex.message));
                 };
                 this.typingTimeout = setTimeout(() => onOsAutodetect(value), 250);
             }