Editing the InstanceRulesFragment for allowing a more coherent color scheme

mastodon/src/main/res/layout/fragment_onboarding_rules.xml

@@ -26,6 +26,7 @@
 			android:layout_marginBottom="16dp"
 			android:minWidth="145dp"
 			style="@style/Widget.Mastodon.M3.Button.Filled"
+			android:visibility="gone"
 			android:text="@string/i_agree" />
 
 	</LinearLayout>

mastodon/src/main/res/layout/item_list_header_simple.xml

@@ -4,7 +4,6 @@
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:textAppearance="@style/m3_body_large"
-	android:textColor="?colorM3OnSurface"
 	android:paddingStart="56dp"
 	android:paddingTop="12dp"
 	android:paddingEnd="24dp"

mastodon/src/main/res/layout/item_server_rule.xml

@@ -15,7 +15,7 @@
 		android:layout_width="24dp"
 		android:layout_height="24dp"
 		android:layout_marginEnd="16dp"
-		android:textColor="?colorM3Primary"
+		android:textColor="?android:colorAccent"
 		android:fontFamily="sans-serif-condensed"
 		android:textStyle="bold"
 		android:textSize="22dp"