LatinIME: update follow system theme label

Update ´Follow system settings´ to ´Material - follow system settings´.

Change-Id: I3c24434f69f91ad58fea52e352351f87d7d3d064
Signed-off-by: Mohammad Hasan Keramat J <ikeramat@protonmail.com>

java/res/values/cm_strings.xml

@@ -27,7 +27,7 @@ disposition rather than other common dispositions for Latin languages. [CHAR LIM
     <string name="subtype_no_language_bepo">Alphabet (Bépo)</string>
     <string name="subtype_hu_ZZ">Hungarian (QWERTY)</string>
 
-    <string name="keyboard_theme_follow_system">Follow system settings</string>
+    <string name="keyboard_theme_material_follow_system">Material - follow system settings</string>
 
     <!-- Title of the settings for setting keyboard height -->
     <string name="prefs_keyboard_height_scale">Keyboard height scale</string>

java/res/values/keyboard-themes.xml

@@ -22,7 +22,7 @@
     <string-array name="keyboard_theme_names" translatable="false">
         <item>@string/keyboard_theme_material_light</item>
         <item>@string/keyboard_theme_material_dark</item>
-        <item>@string/keyboard_theme_follow_system</item>
+        <item>@string/keyboard_theme_material_follow_system</item>
         <item>@string/keyboard_theme_material_you</item>
     </string-array>
     <!-- An element must be a keyboard theme id of