Move escaping function to global scope

PHP is not python and doesn't have the concept of local functions.
Move the escaping function to the global scope so it isn't
redeclared upon every call to get_sql_contribution().

tools/project_manager/projectmgr.php

@@ -117,11 +117,7 @@ function get_sql_contribution()
                         if ( in_array( '', $values ) ) return NULL;
                     }
 
-                    function escape_callback($value)
-                    {
-                        return mysqli_real_escape_string(DPDatabase::get_connection(), $value);
-                    }
-                    $values = array_map("escape_callback", $values);
+                    $values = array_map("escape_value", $values);
 
                     if ( $comparator == '=' )
                     {
@@ -1006,5 +1002,10 @@ function list_uber_projects( $can_see_all )
     }
 }
 
+function escape_value($value)
+{
+    return mysqli_real_escape_string(DPDatabase::get_connection(), $value);
+}
+
 // vim: sw=4 ts=4 expandtab
 ?>