[devtool] fix duplicate rendered indicator on server (#81729)
There're should be only one indicator rendered when `showIndicator` state is true, the previous condition is not correct since the previous change seem causing indicator always rendered even on SSR. since devtool bundle is also bundled on ssr layer, but the related code should not get executed. We noticed the previous condition will always render the indicator, which likely triggered some `base-ui` browser code to execute on server and crash on windows.
Related #81722
