dl: run vfmt over all .v files

vlib/dl/dl.v

@@ -2,7 +2,7 @@ module dl
 
 pub const (
 	version = 1
-	dl_ext    = get_shared_library_extension()
+	dl_ext  = get_shared_library_extension()
 )
 
 pub fn get_shared_library_extension() string {

vlib/dl/dl_windows.c.v

@@ -1,7 +1,7 @@
 module dl
 
 pub const (
-	rtld_now = 0
+	rtld_now  = 0
 	rtld_lazy = 0
 )
 

vlib/dl/example/use.v

@@ -6,7 +6,7 @@ import dl
 type FNAdder = fn (int, int) int
 
 fn main() {
-	library_file_path := os.join_path(os.getwd(), 'library${dl.dl_ext}')
+	library_file_path := os.join_path(os.getwd(), 'library$dl.dl_ext')
 	handle := dl.open(library_file_path, dl.rtld_lazy)
 	eprintln('handle: ${ptr_str(handle)}')
 	mut f := &FNAdder(0)