Increase 32-bit WebView VA reservation.

Most pre-Q devices actually reserved around 130MiB in the 32-bit zygote
for the WebView native library; 100MiB was only the lower limit and the
file size based calculation that older OS versions use would come up
with a larger number. Increase the hardcoded value for Q to 130MiB so
that the behaviour is roughly the same across OS versions.

Fixes: 132081320
Test: manually verified via inspection of process maps
Change-Id: I0f03ac2f118bb0627ea6be229e5064d4590d8afb