enable 7seg by default for CI

Fix a build issue with 7seg.cpp

Change-Id: Iaeab1fd47612742c3ca1783fcd357769c802c7eb
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/7seg.cpp b/7seg.cpp
index daa71f9..da8b2ba 100644
--- a/7seg.cpp
+++ b/7seg.cpp
@@ -64,7 +64,7 @@
     signal(SIGINT, [](int signum) {
         if (signum == SIGINT)
         {
-            sig_recv = true:
+            sig_recv = true;
         }
     });