Revert "Dark theme: load Roboto Bold"

This reverts commit 14fba4ce739ea94c374aa15e7b1169bc58ddeb3e.

Reason for revert: Due to the bug mentioned here:
https://bugs.avm99963.com/p/twpowertools/issues/detail?id=12.

Change-Id: Ia183f7b870b4c5e25eea60baa5bddfc5e9218b78
diff --git a/src/static/css/ccdarktheme.css b/src/static/css/ccdarktheme.css
index 5524f8a..6857eb8 100644
--- a/src/static/css/ccdarktheme.css
+++ b/src/static/css/ccdarktheme.css
@@ -1,5 +1,3 @@
-@import url('https://fonts.googleapis.com/css?family=Roboto:700');
-
 :root {
   --TWPT-primary-text: #e8eaed;
   --TWPT-primary-text-alt: var(--TWPT-primary-text);