[Examples] Fix shader code indentation

[kungfooman]

I was just testing the latest Gaussian Splat example and figured the shader code received a wrong indentation:

Basically it happened through the last line here:

It happens to fit twice and then the spaces-replacement would catch a line twice. I'm sure we could also use a multiline-replacement-regex searching for "start of line", but I don't know how well supported that is across browser etc., so I just kept it somewhat simple.

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[mvaligursky]

perfect, thanks! I way prefer to indent the shaders to make it more readable when working on examples, than formatting it so that it looks fine in browser. Now we have both.