test: make REPL test pass in coverage mode

Make a REPL tab completion test pass in coverage mode by using
`Uin` as the common prefix of all `Uint*Array` globals instead
of `co` which could be a prefix for `console` and `coverage`,
so it doesn't expand the way it's expected to in coverage mode.

PR-URL: #17082
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: addaleax

test/parallel/test-repl-tab-complete.js

@@ -519,8 +519,8 @@ const editor = repl.start({
 editorStream.run(['.clear']);
 editorStream.run(['.editor']);
 
-editor.completer('co', common.mustCall((error, data) => {
-  assert.deepStrictEqual(data, [['con'], 'co']);
+editor.completer('Uin', common.mustCall((error, data) => {
+  assert.deepStrictEqual(data, [['Uint'], 'Uin']);
 }));
 
 editorStream.run(['.clear']);