go/playground: fix mobile UI bug, greater than 9 digits line number hidden bug in mobile devices

[naeemaei]

Fixes golang/go#65150

[gopherbot]

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

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[gopherbot]

Message from Hamed Naeemaei:

Patch Set 2:

(1 comment)

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