Disable the "quick scale" gesture

Disable the default android behaviour where a double tap followed by a
swipe is interpreted as a zoom gesture. Most people seem not to know
about it and hit it by mistake, see #495 for an example.

terminal-view/src/main/java/com/termux/view/GestureAndScaleRecognizer.java

@@ -85,6 +85,7 @@ final class GestureAndScaleRecognizer {
                 return mListener.onScale(detector.getFocusX(), detector.getFocusY(), detector.getScaleFactor());
             }
         });
+        mScaleDetector.setQuickScaleEnabled(false);
     }
 
     public void onTouchEvent(MotionEvent event) {