Remove the lockfile on exit (#14997)

src/app/qtlocalpeer/qtlocalpeer.cpp

@@ -134,6 +134,12 @@ QtLocalPeer::QtLocalPeer(QObject* parent, const QString &appId)
     lockFile.open(QIODevice::ReadWrite);
 }
 
+QtLocalPeer::~QtLocalPeer()
+{
+    lockFile.unlock();
+    lockFile.remove();
+}
+
 bool QtLocalPeer::isClient()
 {
     if (lockFile.isLocked())

src/app/qtlocalpeer/qtlocalpeer.h

@@ -78,6 +78,7 @@ class QtLocalPeer : public QObject
 
 public:
     QtLocalPeer(QObject *parent = nullptr, const QString &appId = QString());
+    ~QtLocalPeer() override;
 
     bool isClient();
     bool sendMessage(const QString &message, int timeout);