gopls/internal/analysis/modernize add space for fix stringscutprefix

[gan-of-culture]

Added a space so the fix does match the pattern shown in
the description / comments.

Without this change the fix of the code would be edited to this:
after, ok :=strings.CutPrefix...

After the change it should looks like this:
after, ok := strings.CutPrefix...

Gofmt will add the space anyway, but it would be nice to have
the space out of the box.

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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[gopherbot]

Message from Tim Cook:

Patch Set 2:

(1 comment)

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