Remove IBinder from CarProjectionManager API

+ minor clean up

Bug: 128925237

Test: m -j
Change-Id: I33a192e5993c6f68682ab540ba2867cba5825c24
diff --git a/service/src/com/android/car/ICarImpl.java b/service/src/com/android/car/ICarImpl.java
index 2df562e..c43547b 100644
--- a/service/src/com/android/car/ICarImpl.java
+++ b/service/src/com/android/car/ICarImpl.java
@@ -580,6 +580,7 @@
                         break;
                     }
                     mCarProjectionService.setUiMode(Integer.valueOf(args[1]));
+                    break;
                 default:
                     writer.println("Unknown command: \"" + arg + "\"");
                     dumpHelp(writer);