Fix line height style in the previous concert cards

Change-Id: I24c17e1640cbfe1402a047d2718319ce098fe53a
diff --git a/css/styles.css b/css/styles.css
index d34ec10..2d517d9 100644
--- a/css/styles.css
+++ b/css/styles.css
@@ -208,6 +208,7 @@
 .concert-subtitle {
   margin: 0 0 32px;
   flex-grow: 1;
+  line-height: initial;
 }
 
 .linkify {