Fix webview loading state finish

[4brunu]

Hi, I found some inconsistency with the current webview loading state implementation.

Sometimes the loadingState ends with Finished, sometimes it ends with Loading(1.0f). So the isLoading var doesn't work reliably.

Here are a few examples that are reproduced with the sample project.

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.0)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Finished
Loading(progress=1.0)

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Loading(progress=1.0)

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Loading(progress=1.0)

Initializing
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Loading(progress=1.0)

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Loading(progress=1.0)

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.1)
Loading(progress=0.0)
Finished

Initializing
Loading(progress=0.0)
Finished

To try to fix this, when the loading value is 100% it changes directly to finished.

Please add the library name to the PR title. Example: "[Insets] Fixes typo"

[Doomsdayrs]

@4brunu Why did you close this pr?

[4brunu]

I'm not sure if this is the right way to fix this issue, and if this solves all the edge cases, so I opened the following issue https://github.com/google/accompanist/issues/1607.