Drop string methods various some types (again)

They were only for debugging and are prone to falling out of sync.

ui/stash.go

@@ -64,14 +64,6 @@ const (
 	stashStateShowingError
 )
 
-func (s stashViewState) String() string {
-	return map[stashViewState]string{
-		stashStateReady:           "ready",
-		stashStateLoadingDocument: "loading document",
-		stashStateShowingError:    "showing error",
-	}[s]
-}
-
 // The types of documents we are currently showing to the user.
 type sectionKey int
 
@@ -82,15 +74,6 @@ const (
 	filterSection
 )
 
-func (s sectionKey) String() string {
-	return map[sectionKey]string{
-		localSection:   "local",
-		stashedSection: "stashed",
-		newsSection:    "news",
-		filterSection:  "filtered",
-	}[s]
-}
-
 // section contains definitions and state information for displaying a tab and
 // its contents in the file listing view.
 type section struct {
@@ -133,14 +116,6 @@ const (
 	filterApplied                    // a filter is applied and user is not editing filter
 )
 
-func (f filterState) String() string {
-	return map[filterState]string{
-		unfiltered:    "unfiltered",
-		filtering:     "filtering",
-		filterApplied: "filter applied",
-	}[f]
-}
-
 // selectionState is the state of the currently selected document.
 type selectionState int
 
@@ -150,14 +125,6 @@ const (
 	selectionPromptingDelete
 )
 
-func (s selectionState) String() string {
-	return map[selectionState]string{
-		selectionIdle:            "idle",
-		selectionSettingNote:     "setting note",
-		selectionPromptingDelete: "prompting for deletion",
-	}[s]
-}
-
 // statusMessageType adds some context to the status message being sent.
 type statusMessageType int
 
@@ -168,14 +135,6 @@ const (
 	errorStatusMessage
 )
 
-func (s statusMessageType) String() string {
-	return map[statusMessageType]string{
-		normalStatusMessage: "normal",
-		subtleStatusMessage: "subtle",
-		errorStatusMessage:  "error",
-	}[s]
-}
-
 // statusMessage is an ephemeral note displayed in the UI.
 type statusMessage struct {
 	status  statusMessageType