Remove rounded corners on chips (for topic tags)

tildes/scss/modules/_chip.scss

@@ -0,0 +1,6 @@
+// Copyright (c) 2019 Tildes contributors <code@tildes.net>
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+.chip {
+  border-radius: 0;
+}

tildes/scss/styles.scss

@@ -8,6 +8,7 @@
 @import 'layout';
 
 @import 'modules/btn';
+@import 'modules/chip';
 @import 'modules/comment';
 @import 'modules/divider';
 @import 'modules/empty';