Fixing broken autocomplition in IDE.

As described in https://bugzilla.mozilla.org/show_bug.cgi?id=1005083 the
nsIAutocompleteResult implementation is missing a method to work as intended.

Fixes issue 7645

Signed-off-by: Alexei Barantsev <barancev@gmail.com>

ide/main/src/components/SeleniumIDEGenericAutoCompleteSearch.js

@@ -99,7 +99,10 @@ AutoCompleteResult.prototype = {
 	},
 	getLabelAt: function getLabelAt(index) {
 		return this.getValueAt(index);
-  },
+	},
+	getFinalCompleteValueAt: function(index) {
+		return this.getValueAt(index);
+	},
 	removeValueAt: function(rowIndex, removeFromDb) {
 	},
     QueryInterface: function (uuid) {