[examples] Fixed shaders_game_of_life for web

[JordSant]

Fixed pre-loading of resources for web compilig of the example shaders_game_of_life.

[raysan5]

@JordSant this is a bit tricky, this change will be override on next rexm update because the tool scans the file looking for Load*() functions and "filename_to_load" to automatically detect required resources and add them to build system.

Would it be possible to refactor the code to load all images at initialization and just use rquired one on pattern change to avoid the pattern = LoadImage(TextFormat("resources/game_of_life/%s.png", presetPatterns[preset].fileName));?

[JordSant]

Yes, later today i will do it

[raysan5]

@JordSant thanks, no hurries!

[raysan5]

@JordSant Great! Thanks for the review!