Remove end user changing logging settings

Fixes
https://github.com/OpenVR-Advanced-Settings/OpenVR-AdvancedSettings/issues/63

Removes the ability for end users to change logging settings. This was
deemed unnecessary because logging is a developer troubleshooting tool
and users being able to change it could almost only introduce problems.

People who want to change the logging settings can compile from source.

src/main.cpp

@@ -4,7 +4,7 @@ INITIALIZE_EASYLOGGINGPP
 
 int main( int argc, char* argv[] )
 {
-    setUpLogging( argc, argv );
+    setUpLogging();
 
     MyQApplication mainEventLoop( argc, argv );
     mainEventLoop.setOrganizationName(