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/versioner/simple.go

@@ -30,7 +30,7 @@ type simple struct {
 }
 
 func newSimple(cfg config.FolderConfiguration) Versioner {
-	var keep, err = strconv.Atoi(cfg.Versioning.Params["keep"])
+	keep, err := strconv.Atoi(cfg.Versioning.Params["keep"])
 	cleanoutDays, _ := strconv.Atoi(cfg.Versioning.Params["cleanoutDays"])
 	// On error we default to 0, "do not clean out the versioned items"