Update use of Sass variable background variant colors

The hardcoded Sass variable assignments to lighter variant background colors
does not work well with the theme-color functions that are used.

Use Bootstrap's built in theme-color-level function to programatically get
a lighter variant color to use for component backgrounds.

https://getbootstrap.com/docs/4.5/getting-started/theming/#functions

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I9d5a1a66c92d347ba1797be5e0810a24c34094f9
diff --git a/src/assets/styles/bmc/custom/_badge.scss b/src/assets/styles/bmc/custom/_badge.scss
index 87b96e6..0b88b49 100644
--- a/src/assets/styles/bmc/custom/_badge.scss
+++ b/src/assets/styles/bmc/custom/_badge.scss
@@ -16,6 +16,6 @@
 }
 
 .badge-primary {
-  background-color: $info-light;
+  background-color: theme-color-light("info");
   color: theme-color("info");
 }
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