ipn/ipnlocal: fix minor typo in shouldUseOneCGNATRoute (#19719)

This fixes a log message where ipn/ipnlocal.shouldUseOneCGNATRoute
would claim that an android machines was actually macOS.

Updates #cleanup
Updates #19652

Signed-off-by: Simon Law <sfllaw@tailscale.com>

ipn/ipnlocal/local.go

@@ -5485,7 +5485,7 @@ func shouldUseOneCGNATRoute(logf logger.Logf, mon *netmon.Monitor, controlKnobs
 			logf("shouldUseOneCGNATRoute: Could not determine if any interfaces use CGNAT: %v", err)
 			return false
 		}
-		logf("[v1] shouldUseOneCGNATRoute: macOS automatic=%v", !hasCGNATInterface)
+		logf("[v1] shouldUseOneCGNATRoute: %s automatic=%v", versionOS, !hasCGNATInterface)
 		if !hasCGNATInterface {
 			return true
 		}