Update UI for support tab.

Bug: 29397123
Bug: 29832054

- Increase spinner dropdown width to contain country names.
- Reduce suggestion counter's right padding.
- Tweak paddings in travel abroad phone dialog.
- Update icon and text for help&feedback / tips&tricks.

Change-Id: Ide52c6f8198d1a13a0fdeb000d7cb9e8c03688ca

res/drawable/ic_help_24dp.xml

@@ -21,12 +21,11 @@
     android:height="24dp"
     android:viewportWidth="24.0"
     android:viewportHeight="24.0"
-    android:tint="?android:attr/colorControlNormal">
+    android:tint="?android:attr/colorAccent">
     <path
-        android:fillColor="#FFFFFFFF"
-        android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48
-        10,-10S17.52,2 12,2zm1,17h-2v-2h2v2zm2.07,-7.75l-0.9,0.92C13.45,12.9 13,13.5
-        13,15h-2v-0.5c0,-1.1 0.45,-2.1 1.17,-2.83l1.24,-1.26c0.37,-0.36 0.59,-0.86 0.59,-1.41
-        0,-1.1 -0.9,-2 -2,-2s-2,0.9 -2,2H8c0,-2.21 1.79,-4 4,-4s4,1.79 4,4c0,0.88
-        -0.36,1.68 -0.93,2.25z"/>
+        android:fillColor="#FF000000"
+        android:pathData="M20,19.59V8l-6,-6H6c-1.1,0 -1.99,0.9 -1.99,2L4,20c0,1.1 0.89,2
+        1.99,2H18c0.45,0 0.85,-0.15 1.19,-0.4l-4.43,-4.43c-0.8,0.52 -1.74,0.83 -2.76,0.83 -2.76,0
+         -5,-2.24 -5,-5s2.24,-5 5,-5 5,2.24 5,5c0,1.02 -0.31,1.96 -0.83,2.75L20,19.59zM9,13c0,1.66
+          1.34,3 3,3s3,-1.34 3,-3 -1.34,-3 -3,-3 -3,1.34 -3,3z"/>
 </vector>

res/drawable/ic_lightbulb_outline_24.xml

@@ -20,7 +20,7 @@
     android:height="24dp"
     android:viewportWidth="24.0"
     android:viewportHeight="24.0"
-    android:tint="?android:attr/colorControlNormal">
+    android:tint="?android:attr/colorAccent">
     <path
         android:fillColor="#FF000000"
         android:pathData="M9,21c0,0.55 0.45,1 1,1h4c0.55,0 1,-0.45 1,-1v-1L9,20v1zM12,2C8.14,2