Update host.py to fix water-leak-detector-app gen (#36683)

Author: lboue

scripts/build/builders/host.py

@@ -159,7 +159,7 @@ def ExamplePath(self):
         elif self == HostApp.ENERGY_MANAGEMENT:
             return 'energy-management-app/linux'
         elif self == HostApp.WATER_LEAK_DETECTOR:
-            return 'water-leak-detector/linux'
+            return 'water-leak-detector-app/linux'
         else:
             raise Exception('Unknown app type: %r' % self)