Remove caddy.upload plugin

Because of this error:

github.com/caddyserver/caddy/caddy/caddymain imports
	blitznote.com/src/caddy.upload: blitznote.com/src/caddy.upload@v1.9.9: parsing go.mod:
	module declares its path as: blitznote.com/src/http.upload
	        but was required as: blitznote.com/src/caddy.upload

build/caddy/plugins.patch

@@ -7,7 +7,6 @@ index e9ce689b..56a4b096 100644
  	_ "github.com/mholt/caddy/caddyhttp" // plug in the HTTP server type
  	// This is where other plugins get plugged in (imported)
 +
-+	_ "blitznote.com/src/caddy.upload"
 +	_ "github.com/SchumacherFM/mailout"
 +	_ "github.com/caddyserver/forwardproxy"
 +	_ "github.com/captncraig/caddy-realip"