Remove redundant #' before lambda in tests

Remove redundant #' before lambda in tests

* test/lisp/electric-tests.el (save-electric-modes)
(inhibit-in-mismatched-string-inside-ruby-comments)
(inhibit-in-mismatched-string-inside-c-comments, js-mode-braces)
(js-mode-braces-with-layout)
(js-mode-braces-with-layout-and-indent, autowrapping-1)
(autowrapping-2, autowrapping-3, autowrapping-4, autowrapping-5)
(autowrapping-6, autowrapping-7):
* test/lisp/progmodes/xref-tests.el
(xref--xref-file-name-display-is-relative-to-project-root):
* test/src/thread-tests.el (threads-signal-early)
(threads-signal-main-thread): Remove redundant #' before lambda.