Further tune config_minScalingSpan for small screen devices.

Bug 7189429

Change-Id: Ia031551d2e1cd2569d21ce4901b454866c4d88c3

Author: adamp

core/res/res/values/config.xml

@@ -936,7 +936,7 @@
          For best results, care should be taken such that this value remains
          larger than the minimum reported touchMajor/touchMinor values
          reported by the hardware. -->
-    <dimen name="config_minScalingSpan">25mm</dimen>
+    <dimen name="config_minScalingSpan">27mm</dimen>
 
     <!-- Safe headphone volume index. When music stream volume is below this index
     the SPL on headphone output is compliant to EN 60950 requirements for portable music