go/analysis/internal/checker: make applyFixes work from the first character

[Abirdcfly]

Make sure modifying the first character of the file takes effect.

Fixes golang/go#54774

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Message from Tim King:

Patch Set 2:

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Message from Abirdcfly Abirdcfly:

Patch Set 2:

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Patch Set 3:

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Patch Set 3:

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Message from Abirdcfly Abirdcfly:

Patch Set 5:

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Message from Tim King:

Patch Set 5:

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Message from Tim King:

Patch Set 6: Run-TryBot+1

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Patch Set 6:

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Patch Set 6:

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Message from Gopher Robot:

Patch Set 7:

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Message from kokoro:

Patch Set 7:

Kokoro presubmit build starting for golang/tools/gopls-legacy/presubmit
Logs at:
https://source.cloud.google.com/results/invocations/40b73334-c1db-4c18-aee6-65c32576f00e

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Message from Abirdcfly Abirdcfly:

Patch Set 7:

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Message from kokoro:

Patch Set 7: gopls-CI+1

Kokoro presubmit build finished with status: SUCCESS
Logs at: https://source.cloud.google.com/results/invocations/40b73334-c1db-4c18-aee6-65c32576f00e

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Message from Gopher Robot:

Patch Set 7: TryBot-Result+1

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Message from Tim King:

Patch Set 7: Code-Review+2

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Message from Benny Siegert:

Patch Set 7: Code-Review+1

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Message from Abirdcfly Abirdcfly:

Patch Set 8:

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This PR is being closed because golang.org/cl/426654 has been merged.