Revert "Merge branch 'fix/httpvfs-chunked-length'"

This reverts commit d4f106f488, reversing
changes made to c5ef1f58ff.

assembler/internal/databases/databases.go

@@ -35,18 +35,10 @@ const driverName = "sqlite"
 // even if the row count somehow passed.
 const minSizeRatio = 0.9
 
-// Extension is the published suffix. The trailing 0 is a chunk index, not a
-// typo: the browser reads the file through sql.js-httpvfs in chunked mode,
-// which is the only mode whose config accepts the file's length. That mode
-// builds each request's URL as urlPrefix + chunkIndex, and one chunk holds the
-// whole database, so the index is always 0 and the prefix is "<id>.sqlite3".
-//
-// The length has to come from the config because the library otherwise takes
-// it from a HEAD request, which GitHub Pages answers with the gzipped size.
-//
-// Not ".db" either: keeping that name free lets the site assembly treat any
-// stray .db or SQLite journal in the output as the leftover it is.
-const Extension = ".sqlite30"
+// Extension is the published suffix. Not ".db": keeping that name free lets
+// the site assembly treat any stray .db or SQLite journal in the output as the
+// leftover it is.
+const Extension = ".sqlite3"
 
 // Paths locates the pieces this package needs.
 type Paths struct {