Update use of Sass variables for better theming

Use Bootstrap color functions for theme-colors and grays instead
of directly referencing Sass variable to allow more flexible
theming.

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: Id08b77ff6df3bdf99400dcdfe964853706f1070f
diff --git a/src/assets/styles/bmc/custom/_badge.scss b/src/assets/styles/bmc/custom/_badge.scss
index 7acd73a..87b96e6 100644
--- a/src/assets/styles/bmc/custom/_badge.scss
+++ b/src/assets/styles/bmc/custom/_badge.scss
@@ -17,5 +17,5 @@
 
 .badge-primary {
   background-color: $info-light;
-  color: $info;
+  color: theme-color("info");
 }
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