Fix typo in Ura: their -> there

 - "it just sat their" -> "it just sat there"

Update/ura_003.txt

@@ -2909,7 +2909,7 @@ void main()
 //rだから描き上げた後、なんとなく美術室の隅っこの壁にひっそりと飾ってはみたが、誰もが特に目を止めることなく、埃をかぶったまま置きざらしになっていたのだ。
 	if (GetGlobalFlag(GADVMode)) { OutputLineAll("", NULL, Line_ContinueAfterTyping); }
 	OutputLine(NULL, "だから描き上げた後、なんとなく美術室の隅っこの壁にひっそりと飾ってはみたが、誰もが特に目を止めることなく、埃をかぶったまま置きざらしになっていたのだ。",
-			NULL, "So after he finished the painting, he hung it on the wall in the corner of the art room, but it just sat their gathering dust, with no one paying it any real attention.", Line_Normal);
+			NULL, "So after he finished the painting, he hung it on the wall in the corner of the art room, but it just sat there gathering dust, with no one paying it any real attention.", Line_Normal);
 	ClearMessage();
 
 	DrawScene("black", 1000 );