make imapserver faster like before again

in the precis password change before the previous release, the password used in
fuzzing wasn't correct, triggering sleeps due to botched protocols often, which
made the tests run much longer.

imapserver/fuzz_test.go

@@ -137,9 +137,9 @@ func FuzzServer(f *testing.F) {
 		// Each command brings the connection state one step further. We try the fuzzing
 		// input for each state.
 		run([]string{})
-		run([]string{"login [email protected] testtest"})
-		run([]string{"login [email protected] testtest", "select inbox"})
+		run([]string{`login [email protected] "` + password0 + `"`})
+		run([]string{`login [email protected] "` + password0 + `"`, "select inbox"})
 		xappend := fmt.Sprintf("append inbox () {%d+}\r\n%s", len(exampleMsg), exampleMsg)
-		run([]string{"login [email protected] testtest", "select inbox", xappend})
+		run([]string{`login [email protected] "` + password0 + `"`, "select inbox", xappend})
 	})
 }