eslint: enable comma-dangle checks

Generated using `eslint --fix`.

Change-Id: I466eb33fccdae8a2e0c6150a1a0a4166a75e2480
Reviewed-on: https://chromium-review.googlesource.com/c/apps/libapps/+/2141061
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
diff --git a/hterm/js/hterm_terminal.js b/hterm/js/hterm_terminal.js
index eff1df5..f42de62 100644
--- a/hterm/js/hterm_terminal.js
+++ b/hterm/js/hterm_terminal.js
@@ -185,7 +185,7 @@
 hterm.Terminal.cursorShape = {
   BLOCK: 'BLOCK',
   BEAM: 'BEAM',
-  UNDERLINE: 'UNDERLINE'
+  UNDERLINE: 'UNDERLINE',
 };
 
 /**
@@ -795,7 +795,7 @@
           if (self.prefs_.get('close-on-exit')) {
             window.close();
           }
-        }
+        },
       });
 
   this.installKeyboard();