Update file icon when its name changes (Mac client)

macosx/FileListNode.m

@@ -131,6 +131,8 @@
         {
             [fName release];
             fName = [newName copy];
+            [fIcon release];
+            fIcon = nil;
             return YES;
         }
     }

macosx/Torrent.m

@@ -1968,6 +1968,9 @@ bool trashDataFile(const char * filename, tr_error ** error)
         [fFlatFileList release];
         [self sortFileList: flatFileList];
         fFlatFileList = flatFileList;
+
+        [fIcon release];
+        fIcon = nil;
     }
     else
         NSLog(@"Error renaming %@ to %@", oldPath, [path stringByAppendingPathComponent: newName]);