Fix more ActivityNotFoundExceptions

[lukstbit]

Purpose / Description

In both the shared decks screen and the account login the user could trigger an ACTION_VIEW(ex. mailto link) which went through our custom tabs implementation which finally tried to start and activity(and failed if no app to handle it was present).

Example bug report: https://ankidroid.org/acra/app/1/bug/280476/report/003eb5ab-bb37-484a-a3f7-0ec9bda1767c
Example stacktrace:

android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=https://ankiweb.net/... pkg=com.power.browser (has extras) }
	at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:2100)
	at android.app.Instrumentation.execStartActivity(Instrumentation.java:1747)
	at android.app.Activity.startActivityForResult(Activity.java:5473)
	at androidx.activity.ComponentActivity.startActivityForResult(ComponentActivity.kt:704)
	at android.app.Activity.startActivity(Activity.java:5813)
	at androidx.core.content.ContextCompat.startActivity(ContextCompat.java:297)
	at androidx.browser.customtabs.CustomTabsIntent.launchUrl(CustomTabsIntent.java:662)
	at com.ichi2.compat.customtabs.CustomTabActivityHelper$Companion.openCustomTab(CustomTabActivityHelper.kt:167)
	at com.ichi2.anki.AnkiActivity.openUrl(AnkiActivity.kt:440)
	at com.ichi2.anki.MyAccount.initAllContentViews$lambda$13(MyAccount.kt:251)
	at android.view.View.performClick(View.java:7792)
	at android.widget.TextView.performClick(TextView.java:16112)
	at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1218)
	at android.view.View.performClickInternal(View.java:7769)
	at android.view.View.access$3800(View.java:910)
	at android.view.View$PerformClick.run(View.java:30218)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loopOnce(Looper.java:226)
	at android.os.Looper.loop(Looper.java:313)
	at android.app.ActivityThread.main(ActivityThread.java:8751)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)

How Has This Been Tested?

Just ran the tests.

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[criticalAY]

Niceee

[mikehardy]

I can't see how this could could possibly be wrong (those are probably famous last words, but whatever)

Thanks for checking on bug reports and posting up the fixes