Increased polling interval to 250 times/sec

Since Windows timers can't do fine-grained resolution, an interval of 4 ms
seemed to be a good balance between polling a lot to reduce input latency
and not taxing the CPU too much.

controllerremapper.cpp

@@ -389,7 +389,7 @@ void ControllerRemapper::run()
     pollTimer->moveToThread(this);
     connect(pollTimer, SIGNAL(timeout()), this, SLOT(poll()), Qt::DirectConnection);
     pollTimer->setTimerType(Qt::PreciseTimer);
-    pollTimer->setInterval(1000 / kPollingCyclesPerSecond);
+    pollTimer->setInterval(4);
 
     if (enabled) {
         pollTimer->start();

controllerremapper.h

@@ -13,7 +13,6 @@
 // The following is a value that an XInput axis is guaranteed never to have, and
 // is therefore safe to use as a flag indicating an unset value:
 #define kAxisUnset -100000
-#define kPollingCyclesPerSecond 150
 
 enum {
     kUp = 0,