Give the modal dialogs a bit less bottom padding

Give modal dialogs slightly less bottom padding.

I believe this was already fixed in a later version of Material Design
Components for the Web - which we don't use because it introduced more
bugs.

Fixes #75.

obelisk/static/main.css

@@ -66,3 +66,8 @@ main.magic-folder-page button[aria-label="Add"] {
   bottom: 32px;
   background-color: #6200ee;  /* This is our primary color. MDC default to the secondary color for FABs for some reason? */
 }
+
+
+.mdc-dialog__title+.mdc-dialog__content, .mdc-dialog__header+.mdc-dialog__content {
+  padding-bottom: 8px;  /* Give the modal dialogs a bit less saggy bottoms, 8px instead of 20px */
+}