[Restructure] Remove hardcoded shader paths

Debug/release builds are hardcoded to expect the shaders folder in a
different path.  This is unnecessary as the new NifSkope.pro will put
the shaders with the EXE just like in the official install.

src/gl/renderer.cpp

@@ -383,17 +383,8 @@ void Renderer::updateShaders()
  releaseShaders();
 
  QDir dir( QApplication::applicationDirPath() );
- if ( 0 == dir.dirName().compare("Release",Qt::CaseInsensitive) 
- ||0 == dir.dirName().compare("Debug",Qt::CaseInsensitive) 
- )
- {
- dir.cd( ".." );
- }
-
  if ( dir.exists( "shaders" ) )
  dir.cd( "shaders" );
- else if ( dir.exists( "/usr/share/nifskope/shaders" ) )
- dir.cd( "/usr/share/nifskope/shaders" );
 
 // linux does not want to load the shaders so disable them for now
 #ifdef WIN32