fix(T2418): Make buttons in the composer footer 4px taller

Fixes https://phab.nylas.com/T2418 ("Fixes")

internal_packages/calendar-bar/lib/main.cjsx

@@ -1,11 +1,9 @@
 React = require "react"
-CalendarBar = require "./calendar-bar"
 
 module.exports =
-
   activate: (@state) ->
     # Package turned off for now
-    
+
   deactivate: ->
 
   serialize: -> @state

internal_packages/composer/stylesheets/composer.less

@@ -51,6 +51,10 @@
     background: transparent;
     border-bottom: 0;
 
+    .btn {
+      // Yes, 4px taller than in the rest of the app: https://phab.nylas.com/T2418
+      height:28px;
+    }
     .composer-action-bar-content {
       display:flex;
       margin: 0 auto;