Android ANR: On Oreo (8.1) and below, the app freezes when choosing t…

…o submit a Breakage report (#4142)

Task/Issue URL:
https://app.asana.com/0/488551667048375/1206404678635835/f

### Description
Fixed ANR when choosing to submit a breakage report on Oreo and below.

### Steps to test this PR

_Reproduce the issue_
- [ ] Install from `develop` on a device with Android 8.1 or below.
- [ ] Navigate to a website.
- [ ] Open the menu and tap on "Report Broken Site".
- [ ] Notice that nothing happens in the UI and then an ANR is
encountered.

_Test the fix_
- [ ] Install from `this branch` on a device with Android 8.1 or below.
- [ ] Navigate to a website.
- [ ] Open the menu and tap on "Report Broken Site".
- [ ] Notice the `Report Broken Site` screen is displayed and you can
send a report.

### NO UI changes

app-tracking-protection/vpn-impl/src/main/res/layout/activity_report_breakage_category_single_choice.xml

@@ -50,6 +50,8 @@
                     android:layout_height="wrap_content"
                     android:hint="@string/atp_ReportBreakageCategoriesHint"
                     app:clickable="true"
+                    android:focusable="true"
+                    android:focusableInTouchMode="true"
                     app:endIcon="@drawable/ic_chevron_down_24_small"
                     app:layout_constraintEnd_toEndOf="parent"
                     app:layout_constraintStart_toStartOf="parent"/>

app/src/main/res/layout/content_broken_sites.xml

@@ -76,6 +76,8 @@
             android:layout_marginEnd="@dimen/keyline_4"
             android:hint="@string/brokenSitesCategoriesHint"
             app:clickable="true"
+            android:focusable="true"
+            android:focusableInTouchMode="true"
             app:endIcon="@drawable/ic_chevron_down_24_small"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"