For #9857: Updates onboarding button styles

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

@@ -4,6 +4,7 @@
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 <Button xmlns:android="http://schemas.android.com/apk/res/android"
     style="@style/FinishOnboardingButton"
+    android:layout_height="36dp"
     android:id="@+id/finish_button"
     android:layout_marginBottom="16dp"
     android:text="@string/onboarding_finish" />

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

@@ -25,6 +25,7 @@
     <Button
         style="@style/NeutralButton"
         android:id="@+id/turn_on_sync_button"
+        android:layout_height="36dp"
         android:layout_marginTop="16dp"
         android:text="@string/onboarding_firefox_account_sign_in"
         app:backgroundTint="@color/foundation_light_theme" />

app/src/main/res/values/styles.xml

@@ -248,6 +248,7 @@
     <!-- Ideally we should consolidate this with NeutralButton in the future -->
     <style name="NeutralOnboardingButton" parent="NeutralButton">
         <item name="backgroundTint">?onboardingActionButtonBackground</item>
+        <item name="android:layout_height">36dp</item>
         <item name="android:textColor">?primaryText</item>
     </style>
 
@@ -267,7 +268,6 @@
         <item name="android:textColor">?onboardingFinishButtonText</item>
     </style>
 
-
     <style name="search_pill" parent="Widget.AppCompat.Button.Borderless">
         <item name="android:layout_width">wrap_content</item>
         <item name="android:layout_height">32dp</item>