dont prepend ./ to the binary being lauched, it should be in $PATH

Index: Pdf4QtLaunchPad/launchdialog.cpp
--- Pdf4QtLaunchPad/launchdialog.cpp.orig
+++ Pdf4QtLaunchPad/launchdialog.cpp
@@ -107,7 +107,7 @@ void LaunchDialog::startProgram(const QString& program
 {
 #ifndef Q_OS_WIN
     QString appDir = qgetenv("APPDIR");
-    QString internalToolPath = appDir.isEmpty() ? QString("./%1").arg(program)
+    QString internalToolPath = appDir.isEmpty() ? QString("%1").arg(program)
                                                 : QString("%1/usr/bin/%2").arg(appDir, program);
 
     qint64 pid = 0;
