Fix default render modes not being the same as Fire display mode

Special effects like EMBR sparks weren't included, this only affected the renderer, causing those special effects to not render.

src/PowderToyRenderer.cpp

@@ -64,6 +64,10 @@ int main(int argc, char *argv[])
 	ByteString ppmFilename, ptiFilename, ptiSmallFilename, pngFilename, pngSmallFilename;
 	std::vector<char> ppmFile, ptiFile, ptiSmallFile, pngFile, pngSmallFile;
 
+	if (!argv[1] || !argv[2]) {
+		std::cout << "Usage: " << argv[0] << " <inputFilename> <outputPrefix>" << std::endl;
+		return 1;
+	}
 	inputFilename = argv[1];
 	outputPrefix = argv[2];
 

src/graphics/Renderer.cpp

@@ -2940,7 +2940,7 @@ unsigned int Renderer::GetColourMode()
 
 void Renderer::ResetModes()
 {
-	SetRenderMode({ RENDER_BASC, RENDER_FIRE, RENDER_SPRK });
+	SetRenderMode({ RENDER_BASC, RENDER_FIRE, RENDER_SPRK, RENDER_EFFE });
 	SetDisplayMode({ });
 	SetColourMode(COLOUR_DEFAULT);
 }