MAI test scenario: fix string that caused trouble for translations

Somehow the combination of “” and new lines caused the string to be
terminated prematurely when it was extracted into the .pot file.  Fixed
by removing the “”.

data/ai/micro_ais/scenarios/The_Elves_Besieged.cfg

@@ -215,7 +215,7 @@
             message= _ "There are too many to fight, far too many. We must escape!"
         [/message]
         # wmllint: unbalanced-on
-        {MESSAGE narrator "wesnoth-icon.png" "" _"This is a reenactment of scenario ""The Elves Besieged"" of the mainline campaign ""Heir to the Throne"", just that the AI is playing Konrad's side here. The goal is to move Konrad to the signpost in the northwest, while keeping both Konrad and Delfador alive. The same AI as in scenario ""Protect Unit"" is used.
+        {MESSAGE narrator "wesnoth-icon.png" "" _"This is a reenactment of scenario The Elves Besieged of the mainline campaign Heir to the Throne, just that the AI is playing Konrad's side here. The goal is to move Konrad to the signpost in the northwest, while keeping both Konrad and Delfador alive. The same AI as in scenario Protect Unit is used.
 
 Note: The Protect Unit AI is coded as a Micro AI. A Micro AI can be added and adapted to the need of a scenario easily using only WML and the [micro_ai] tag. Check out the <span color='#00A000'>Micro AI wiki page</span> at http://wiki.wesnoth.org/Micro_AIs for more information."}
         # wmllint: unbalanced-off