Make the SIMPLEX contact-info action icons white

The round accent buttons in the contact-info screen (search, call, video,
mute) showed dark icons on the cyan fill on SIMPLEX. They are now white;
the other themes are unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/ChatInfoView.kt

@@ -1062,7 +1062,7 @@ fun InfoViewActionButton(
             icon,
             contentDescription = null,
             Modifier.size(22.dp * fontSizeSqrtMultiplier),
-            tint = if (disabledLook) MaterialTheme.colors.secondary else MaterialTheme.colors.onPrimary
+            tint = if (disabledLook) MaterialTheme.colors.secondary else if (CurrentColors.value.base == DefaultTheme.SIMPLEX) Color.White else MaterialTheme.colors.onPrimary
           )
         }
       }