Make log clear failures a warning

Summary:
Logcat can sometimes fail to clear the logs for some reason.
There's nothing we can do about this as we're directly calling out to adb.

Reviewed By: lawrencelomax

Differential Revision: D34749970

fbshipit-source-id: 2166717ace491f7b73b380576392638ef9276b78

desktop/flipper-server-core/src/devices/android/AndroidDevice.tsx

@@ -91,7 +91,9 @@ export default class AndroidDevice extends ServerDevice {
   }
 
   clearLogs(): Promise<void> {
-    return this.executeShellOrDie(['logcat', '-c']);
+    return this.executeShellOrDie(['logcat', '-c']).catch((e) => {
+      console.warn('Failed to clear logs:', e);
+    });
   }
 
   async navigateToLocation(location: string) {