Fix(example): Toggle video source many times throws PlatformException on Android

[magno-castro]

I runned the package last version (1.7.1) example in my device (Poco F1) and if I press the "toggle video src" button about 8 times, it throws the PlatformException above:

I noticed that toggleVideo function calls initializePlayer, but without dispose controllers.

So, dispose controllers before reinitialize fix this problem.

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[diegotori]

@magno-castro Can you extract those lines into a method so that they can be called from multiple places (i.e. dispose), not just when toggling the next video?

Thanks in advance.

[magno-castro]

Nice, i will do it

[diegotori]

@magno-castro are you still working on this PR?