Increase vscroll speed by a factor of two

The default two-finger scroll is somewhat slow; double it.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
diff --git a/driver/multitouch.c b/driver/multitouch.c
index f232914..c9b8bce 100644
--- a/driver/multitouch.c
+++ b/driver/multitouch.c
@@ -27,7 +27,7 @@
 #endif
 
 /* these should be user-configurable at some point */
-static const float vscroll_fraction = 0.05;
+static const float vscroll_fraction = 0.025;
 static const float hscroll_fraction = 0.05;
 static const float vswipe_fraction = 0.25;
 static const float hswipe_fraction = 0.25;