PGE update for emscripten comand.

Crawler/olcPixelGameEngine.h

@@ -123,8 +123,7 @@ This means you can run your application in teh browser, great for distributing
 and submission in to jams and things! It's a bit new at the moment. 
 
 em++ -std=c++17 -O2 -s ALLOW_MEMORY_GROWTH=1 -s MAX_WEBGL_VERSION=2 -s MIN_WEBGL_VERSION=2 -s USE_LIBPNG=1 ./YourSource.cpp -o pge.html
-em++ -std=c++17 -O2 -s ALLOW_MEMORY_GROWTH=1 -s MAX_WEBGL_VERSION=2 -s MIN_WEBGL_VERSION=2 -s USE_LIBPNG=1 $(Get-ChildItem *.cpp) -o
-pge.html --preload-file assets
+em++ -std=c++17 -O2 -s ALLOW_MEMORY_GROWTH=1 -s MAX_WEBGL_VERSION=2 -s MIN_WEBGL_VERSION=2 -s USE_LIBPNG=1 $(Get-ChildItem *.cpp) -o pge.html --preload-file assets
 
 
 Using stb_image.h