Change search key from 's' to 'q' on unit/job lists

Avoids a conflict with the "suspend job" option (added in 0.40.12)

plugins/search.cpp

@@ -998,6 +998,11 @@ private:
         return true;
     }
 
+    char get_search_select_key()
+    {
+        return 'q';
+    }
+
     vector<df::job*> *get_secondary_list() 
     {
         return &viewscreen->jobs[viewscreen->page];
@@ -1568,6 +1573,11 @@ private:
         return desc;
     }
 
+    char get_search_select_key()
+    {
+        return 'q';
+    }
+
     vector<df::unit*> *get_secondary_list() 
     {
         return &viewscreen->units;