Fix vertical candidate highlight color on Yosemite

Source/CandidateUI/VTVerticalCandidateController.m

@@ -93,6 +93,7 @@ static const CGFloat kCandidateTextLeftMargin = 8.0;
         [_tableView setDelegate:self];
         
         NSTableColumn *column = [[[NSTableColumn alloc] initWithIdentifier:@"candidate"] autorelease];
+        [column setDataCell:[[[NSTextFieldCell alloc] init] autorelease]];
         [column setEditable:NO];
         
         [_tableView addTableColumn:column];