disable 'pinch zoom' features

* https://stackoverflow.com/questions/22999829/disable-chrome-pinch-zoom-for-use-in-kiosk

busunit/DIUv2/diu_kiosk.capacitive

@@ -54,6 +54,8 @@ mv $tmpfn $BASEDIR/.config/chromium/Preferences
   --disable-infobars \
   --aggressive-cache-discard \
   --incognito \
+  --disable-pinch \
+  --overscroll-history-navigation=0 \
   --kiosk \
   'http://localhost:60535'
 

busunit/DIUv2/diu_kiosk.resistive

@@ -58,6 +58,8 @@ mv $tmpfn $BASEDIR/.config/chromium/Preferences
   --disable-infobars \
   --aggressive-cache-discard \
   --incognito \
+  --disable-pinch \
+  --overscroll-history-navigation=0 \
   --kiosk \
   'http://localhost:60535'