console: ensure we fill missing values including the last one

BETWEEN is inclusive, while FILL excludes the upper bound. This may
trigger a subtle bug where sometimes, one axis has one value the other
does not have.

console/widgets.go

@@ -212,7 +212,7 @@ AND InIfBoundary = 'external'
 GROUP BY Time
 ORDER BY Time WITH FILL
  FROM {{ .TimefilterStart }}
- TO {{ .TimefilterEnd }}
+ TO {{ .TimefilterEnd }} + INTERVAL 1 second
  STEP {{ .Interval }}
 {{ end }}`,
 		templateContext(inputContext{