Spell default packedgitlimit slightly differently
Spell default packedgitlimit slightly differently

This is shorter and easier to read, and also makes sure the
constant expression does not overflow integer range.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git