style: gofumpt all the things (#9829)

Literally `gofumpt -w .` from the top level dir. Guaranteed to be minor
style changes only and nothing else.

@imsodin per request?

lib/dialer/internal.go

@@ -16,9 +16,7 @@ import (
 	"golang.org/x/net/proxy"
 )
 
-var (
-	noFallback = os.Getenv("ALL_PROXY_NO_FALLBACK") != ""
-)
+var noFallback = os.Getenv("ALL_PROXY_NO_FALLBACK") != ""
 
 func init() {
 	proxy.RegisterDialerType("socks", socksDialerFunction)