Remove unused variable

Author: icc-guerrero

android/src/main/java/com/incomingcall/IncomingCallModule.java

@@ -24,7 +24,6 @@ public class IncomingCallModule extends ReactContextBaseJavaModule {
 
     private static final String TAG = "RNIC:IncomingCallModule";
     private WritableMap headlessExtras;
-    private Timer t;
 
     public IncomingCallModule(ReactApplicationContext context) {
         super(context);