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Backpack menu items in the workspace, i.e. Copy All to Backpack and
Paste All From Backpack were broken during the transition to the
latest Blockly. This commit changes any checks for the backpack
presence to use the hasBackpack() test added to WorkspaceSvg.

Change-Id: Iae7919d173f5a5f75003c0132d1f116af9839bd0