fix(sqlite): revert to default page cache size (#10362)

While we're figuring out optimal defaults, reduce the page cache size to
the compiled-in default. In my computer this makes no difference in
benchmarks. In forum threads, it solved the problem of massive memory
usage during initial scan.

Signed-off-by: Jakob Borg <jakob@kastelo.net>

internal/db/sqlite/db_open_cgo.go

@@ -14,5 +14,5 @@ import (
 
 const (
 	dbDriver      = "sqlite3"
-	commonOptions = "_fk=true&_rt=true&_cache_size=-65536&_sync=1&_txlock=immediate"
+	commonOptions = "_fk=true&_rt=true&_sync=1&_txlock=immediate"
 )