otasigcheck: set verification package to com.android.htmlviewer

We need to use something that will always be there and not replaced
by other packages.

Change-Id: Ide942865f284239ae2ae2503005ccc7e8272995c

prebuilt/common/bin/otasigcheck.sh

@@ -4,7 +4,7 @@
 # system
 
 if [ -f /data/system/packages.xml -a -f /tmp/releasekey ]; then
-  relCert=$(grep -A3 'package name="com.android.providers.calendar"' /data/system/packages.xml  | grep "cert index" | head -n 1 | sed -e 's|.*"\([[:digit:]]\)".*|\1|g')
+  relCert=$(grep -A3 'package name="com.android.htmlviewer"' /data/system/packages.xml  | grep "cert index" | head -n 1 | sed -e 's|.*"\([[:digit:]]\)".*|\1|g')
 
   grep "cert index=\"$relCert\"" /data/system/packages.xml | grep -q `cat /tmp/releasekey`
   if [ $? -ne 0 ]; then