Fixup OSX system session file loading request

Mixer.cpp

@@ -112,9 +112,7 @@ Mixer::Mixer() : session_(nullptr), back_session_(nullptr), current_view_(nullpt
     current_source_index_ = -1;
 
     // auto load if Settings ask to
-    if ( !Settings::application.argument_file.empty())
-        load( Settings::application.argument_file );
-    else if ( Settings::application.recentSessions.load_at_start &&
+    if ( Settings::application.recentSessions.load_at_start &&
          Settings::application.recentSessions.front_is_valid &&
          Settings::application.recentSessions.filenames.size() > 0 &&
          Settings::application.fresh_start)

Settings.h

@@ -168,7 +168,6 @@ struct Application
     // Verification
     std::string name;
     std::string executable;
-    std::string argument_file;
 
     // Global settings Application interface
     float scale;
@@ -209,7 +208,7 @@ struct Application
     History recentFolders;
     History recentImport;
 
-    Application() : fresh_start(false), name(APP_NAME), executable(""), argument_file("") {
+    Application() : fresh_start(false), name(APP_NAME), executable(APP_NAME) {
         scale = 1.f;
         accent_color = 0;
         pannel_stick = false;

main.cpp

@@ -34,7 +34,7 @@
 #if defined(APPLE)
 extern "C"{
     void forward_load_message(const char * filename){
-        Settings::application.argument_file = std::string(filename);
+        Mixer::manager().load(filename);
     }
 }
 #endif
@@ -55,7 +55,7 @@ int main(int argc, char *argv[])
             Settings::Save();
         else {
             // try to open the file
-            Settings::application.argument_file = argument;
+            Mixer::manager().load(argument);
         }
     }