fix ru translation (field calculator's -)

git-svn-id: http://svn.osgeo.org/qgis/trunk@12397 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: jef

i18n/qgis_ru.ts

@@ -9736,7 +9736,7 @@ The database said:
     </message>
     <message>
         <source>-</source>
-        <translation>‒</translation>
+        <translation></translation>
     </message>
     <message>
         <source>/</source>