[StartSurface] Correct RTL for the tab switcher title

Screenshot:
https://drive.google.com/file/d/11nP7UVbol-7HM50Pm0LBcP5Mlwt8qzRL/view?usp=sharing

Bug: 1091041
Change-Id: I230f3e8be0fbb330dc23edc7782e61708ca74701
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2230766
Auto-Submit: Ganggui Tang <gogerald@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775204}

chrome/android/features/tab_ui/java/res/layout/tasks_view_layout.xml

@@ -52,9 +52,10 @@
                 android:layout_height="wrap_content"
                 android:layout_weight="1.0"
                 android:layout_gravity="center_vertical"
-                android:gravity="center_vertical"
+                android:gravity="center_vertical|start"
                 android:paddingStart="6dp"
                 android:singleLine="true"
+                android:textAlignment="viewStart"
                 android:textAppearance="@style/TextAppearance.TextMediumThick.Primary"
                 android:text="@string/tab_switcher_carousel_title" />
             <TextView