Fix composer not displaying on iPad

app/javascript/flavours/glitch/styles/components/drawer.scss

@@ -43,8 +43,7 @@
     position: relative;
     flex-direction: column;
     padding: 0;
-    width: 100%;
-    height: 100%;
+    flex-grow: 1;
     background: lighten($ui-base-color, 13%);
     overflow-x: hidden;
     overflow-y: auto;