internal/lsp/source: return obj decl first in find-references
internal/lsp/source: return obj decl first in find-references

Restore previous behavior where the object's declaration is returned
as the first reference in find-reference calls.

Fixes golang/go#36598.

Change-Id: Ibdeaf9971aa5cb1f3244f6a888fe77bdf386e563
Reviewed-on: https://go-review.googlesource.com/c/tools/+/215057
Run-TryBot: Muir Manders <f51fb43e34cc3dd13703253fda59ef2c5e0b683b@mnd.rs>
Reviewed-by: Rebecca Stambler <d7cf11e5f299d88ea8348366a9fc4f7c335c3afa@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools