remove useless useRethink flag from android target

Author: danielpsantiago

src/target/java_android.cr

@@ -751,11 +751,6 @@ END
             final TimerTask task = new TimerTask() {
                 @Override
                 public void run() {
-#{String.build do |io|
-    unless @ast.options.useRethink
-      io << "\n                    timer.cancel();"
-    end
-  end}
                     sentCount[0] += 1;
                     if (sentCount[0] >= 22 || (sentCount[0] * 2000) >= http.connectTimeoutMillis()) {
                         if (!shouldReceiveResponse[0]) return;