refactor: unify eventCard.module.scss files

make identical:
 - apps/*/src/domain/event/eventCard/eventCard.module.scss files
by adding same color definitions to events-helsinki's version as was in
sports-helsinki and hobbies-helsinki. Tried to check if this made any
difference in the UI and couldn't find any difference.

refs LIIKUNTA-455

Author: karisal-anders

apps/events-helsinki/src/domain/event/eventCard/eventCard.module.scss

@@ -8,6 +8,7 @@
   word-break: break-word;
   min-width: fit-content;
   background-color: var(--color-white);
+  color: var(--color-primary-black);
   display: grid;
   grid-template-columns: var(--width-image) 1fr;
   height: 100%;
@@ -83,6 +84,7 @@
 
       .eventName {
         order: 3;
+        color: var(--color-primary-black);
         font-size: var(--fontsize-body-l);
         font-weight: 600;
         line-height: var(--lineheight-l);