Support showing polyline distance if enabled
Support showing polyline distance if enabled

As discussed in https://github.com/Leaflet/Leaflet/issues/5266 , modern web browsers like Chrome/Chromium/Opera support touch events. Thus, L.Browser.touch returns true even on non-touch screens. In any case, the _getTooltipText should display the distance if showLength is set to true. Without this change, showLength is broken in many browsers for Polyline.
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