Fixes #1651 - search & compare opens file instead of diff

[Svaught598]

Description

Closes #1651. Instead of opening a diff from the Search & Compare view, this opens the current revision's file.

The use case seems to be setting a up the workspace, so line numbers seem to be inconsequential here. Can definitely put that back in if it's needed.

Checklist

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[eamodio]

@Svaught598 Thanks for the contribution, but this would need to be on a setting new setting, e.g. gitlens.views.<view-name>.files.openDiffOnClick which would default to true. Also we should definitely keep jumping to the line number of the first diff hunk.

Thanks!