fix: infer tabSize sent in the LSP formattingOptions (#422)

Author: masonkatz

copilot.el

@@ -710,7 +710,7 @@ automatically, browse to %s." user-code verification-uri))
   (save-restriction
     (widen)
     (list :version copilot--doc-version
-          :tabSize tab-width
+          :tabSize (copilot--infer-indentation-offset)
           :indentSize (copilot--infer-indentation-offset)
           :insertSpaces (if indent-tabs-mode :json-false t)
           :path (buffer-file-name)