fix: broken goals accomplished (#8242)

This PR fixes the 'goals accomplished' diagnostics. They were
accidentally broken in #7902.

Regression test tbd in a future PR.

(cherry picked from commit 65b37b4)

Author: mhuisi

src/Lean/Elab/MutualDef.lean

@@ -1165,7 +1165,7 @@ is error-free and contains no syntactical `sorry`s.
 -/
 private def logGoalsAccomplishedSnapshotTask (views : Array DefView)
     (defsParsedSnap : DefsParsedSnapshot) : TermElabM Unit := do
-  if Lean.Elab.inServer.get (← getOptions) then
+  if ! Lean.Elab.inServer.get (← getOptions) then
     -- Skip 'goals accomplished' task if we are on the command line.
     -- These messages are only used in the language server.
     return