cmd/govim: do not remove highlights on delta when auto-highlighting #857
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In 3139f79 I incorrectly removed all reference highlights when a delta
is received. However, the logic prior to that change was that highlights
would only be moved (even in insert mode) if the cursor falls outside of
a highlighted range.
Therefore, we adopt exactly the logic that @leitzler proposed in #852 to
only remove highlights on delta if we are in manual highlighting mode.