fix: return discovered port when packager is already running on a different port

When the default port is unavailable and `getNextPort` finds a packager
already running on a different port for the same project,
`handlePortUnavailable` correctly logs the discovered port but returns
the original (unavailable) port. This causes the build to pass the wrong
port to gradle/xcodebuild.

Author: janicduplessis

packages/cli-tools/src/handlePortUnavailable.ts

@@ -18,6 +18,7 @@ const handlePortUnavailable = async (
 
   if (!start) {
     packager = false;
+    port = nextPort;
     logAlreadyRunningBundler(nextPort);
   } else {
     const {change} = await askForPortChange(port, nextPort);