Add ESC mapping for Pixel C keyboard

Now that we have "replace" key event support in the framework we can map
ESC as AltR+1.

Bug: 24504154

Change-Id: Ief8a50098fc5484171011f268ffc22a309cbba62
diff --git a/data/keyboards/Vendor_18d1_Product_5018.kcm b/data/keyboards/Vendor_18d1_Product_5018.kcm
index ddcac75..0ca85a2 100644
--- a/data/keyboards/Vendor_18d1_Product_5018.kcm
+++ b/data/keyboards/Vendor_18d1_Product_5018.kcm
@@ -197,6 +197,7 @@
     label:                              '1'
     base:                               '1'
     shift:                              '!'
+    ralt:                               replace ESCAPE
 }
 
 key 2 {