Clean up vschema generation for external db

Signed-off-by: jawabuu <49921621+jawabuu@users.noreply.github.com>

examples/compose/vtcompose/vtcompose.go

@@ -116,7 +116,6 @@ func main() {
       //This is no longer necessary, but we'll keep it for reference
       //https://github.com/vitessio/vitess/pull/4868, https://github.com/vitessio/vitess/pull/5010
       //vSchemaFile = applyJsonInMemoryPatch(vSchemaFile,`[{"op": "add","path": "/tables/*", "value": {}}]`)
-      vSchemaFile = applyJsonInMemoryPatch(vSchemaFile,`[{"op": "replace","path": "/sharded", "value": false}]`)
 		} else {
 			var primaryTableColumns map[string]string
 			vSchemaFile, primaryTableColumns = addTablesVschemaPatch(vSchemaFile, keyspaceData.schemaFileNames)