Fix compiler warning

Introduced in 0aa8f7640.

MSVC warned about performing 32-bit bit shifting when it appeared like we
might like a 64-bit result.  We did, but it just so happened that none of
the calls to this function could have caused the 32-bit shift to overflow.

Here we just cast the constant to int64 to make the compiler happy.

Discussion: 
https://postgr.es/m/caaphdvofa_vsrpc13mq_hzyuye5b-sskeaer04oouxyco5-...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/fe4f36bcde182d57dee5dba898076aba5d826515

Modified Files
--------------
src/backend/utils/adt/dbsize.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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