Fixes Android minSdkVersion override

[bayssmekanique]

This removes the minSDK from being automatically added to the AndroidManifest.xml file and instead checks that a sufficient minSdkVersion only sets a minSdkVersion when necessary.

Fixes issue: https://github.com/google/cordova-plugin-browsertab/issues/7

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[bayssmekanique]

I have attempted several times to sign the CLA, but it keeps giving me a A server error occurred, please try your request again. error.

[iainmcgin]

Hey,

Thanks for this contribution! I don't know why you're having trouble with the CLA; if that's still happening I'll try and find someone to help. Unfortunately I can't merge the change until we have confirmation it is signed :(

[bayssmekanique]

@iainmcgin, I have tried from multiple computers, using Stable and Canary, incognito mode, even tried from Edge. Same error with all of them. No errors in the console and the actual POST request returns 200, so I'm not certain what to do.

[iainmcgin]

I have contacted support with regards to the CLA, I'll let you know what they find out.

[bayssmekanique]

I signed it!

[googlebot]

CLAs look good, thanks!