debugger: align message with Node.js standard

Node.js uses (or will use) _Ctrl+C_ with no spaces. To unify the
messages from inspect with other messages from the REPL and elsewhere,
make that change in node-inspect too.

PR-URL: nodejs#38400
Backport-PR-URL: nodejs#39446
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/inspector/inspect_repl.js

@@ -1008,7 +1008,7 @@ function createRepl(inspector) {
 
         repl.setPrompt('> ');
 
-        print('Press Ctrl + C to leave debug repl');
+        print('Press Ctrl+C to leave debug repl');
         repl.displayPrompt();
       },
 
@@ -1080,7 +1080,7 @@ function createRepl(inspector) {
     repl.on('reset', initializeContext);
 
     repl.defineCommand('interrupt', () => {
-      // We want this for testing purposes where sending CTRL-C can be tricky.
+      // We want this for testing purposes where sending Ctrl+C can be tricky.
       repl.emit('SIGINT');
     });
 

test/sequential/test-debugger-exec.js

@@ -31,7 +31,7 @@ const assert = require('assert');
     .then(() => {
       assert.match(
         cli.output,
-        /Press Ctrl \+ C to leave debug repl\n+> /,
+        /Press Ctrl\+C to leave debug repl\n+> /,
         'shows hint for how to leave repl');
       assert.doesNotMatch(cli.output, /debug>/, 'changes the repl style');
     })