Fix for "wrong context menu is displayed"

 Fix for "wrong context menu is displayed"

 [Title] Fix for displaying correct context menu in case of a link
         tag with image and text tags as children.
 [Issue#] WEB-2938
 [Problem] When user taps on "Selection mode" on a context-menu with images
           below, again the same items are added to the menu rather than
           items specific to images.
 [Cause] When user taps on "Selection mode", various context-menu
           items are added to it. Here check for range selection was missing.
 [Solution] Added condition for frame->selection()->isRange() along with others
            while appending context-menu items.
 [Developer] Dhirendra Kumar(dhirendra.kr@samsung.com)

Change-Id: I1bfc30693c937175fc52cf15ca539a6faddd0682