v5.4 Rendering fixes

• Fix the background opacity being used as the graph foreground opacity.
• Fix the key color not being inverted when the background opacity is 0%.
• Fixed some rendering issues when only displaying a single panel.
• Fix changing the colors resetting the key counters.
• Fix the pause check mark in the right click menu not being toggled by Ctrl + T.
• Change overlay osu! to overlay mode since it doesn't always overlay osu! properly.