Update the unselected button text color

Screenshot: https://screenshot.googleplex.com/Y2heRw8DUBD.png

Test: Manually
Bug: 157871225
Change-Id: I3a9320b53a751201469a82019dd46a63da850a0c
diff --git a/res/values/colors.xml b/res/values/colors.xml
index 7494dbe..e85575a 100755
--- a/res/values/colors.xml
+++ b/res/values/colors.xml
@@ -43,7 +43,7 @@
     <color name="google_grey700">#5f6368</color>
     <color name="edit_background_base">@color/google_grey700</color>
     <color name="option_border_default">@color/edit_background_base</color>
-    <color name="full_preview_tab_unselected_text_color">@color/material_grey600</color>
+    <color name="full_preview_tab_unselected_text_color">@color/black_55_alpha</color>
     <color name="bottom_bar_background_color">@color/material_white_100</color>
     <color name="bottom_bar_icon_unchecked_color">@color/material_grey600</color>
     <color name="action_bar_bottom_sheet_text_color">@color/black_87_alpha</color>
diff --git a/res/values/picker_colors.xml b/res/values/picker_colors.xml
index f3794ec..5c67345 100755
--- a/res/values/picker_colors.xml
+++ b/res/values/picker_colors.xml
@@ -17,6 +17,7 @@
     <color name="black_24_alpha">#3D000000</color>
     <color name="black_38_alpha">#61000000</color>
     <color name="black_54_alpha">#8A000000</color>
+    <color name="black_55_alpha">#8C000000</color>
     <color name="black_67_alpha">#AB000000</color>
     <color name="black_87_alpha">#DE000000</color>
     <color name="translucent_black_lighter">#59000000</color>