Add missing combining diacritic for macron.

Bug: 30099760
Change-Id: I2a2f295906501bec243471596a3102f694faaa87
diff --git a/DragonKeyboard/res/raw/keyboard_layout_dragon_english_us_intl.kcm b/DragonKeyboard/res/raw/keyboard_layout_dragon_english_us_intl.kcm
index 9bfef0b..1ab9da1 100644
--- a/DragonKeyboard/res/raw/keyboard_layout_dragon_english_us_intl.kcm
+++ b/DragonKeyboard/res/raw/keyboard_layout_dragon_english_us_intl.kcm
@@ -43,6 +43,7 @@
     base:                               '3'
     shift:                              '#'
     ralt:                               '\u00b3'
+    ralt+shift:                         '\u0304'
 }
 
 key 4 {