[Dark Theme] Make icons in read threads more prominent

In the Community Console thread list, icons next to the titles of read
threads have very little opacity. This change increases the opacity so
they stand more in the dark theme.

Fixes: #11
Change-Id: I92db9fe9ea624cae07c02108141dc7e978d4c26a
diff --git a/src/injections/ccdarktheme.css b/src/injections/ccdarktheme.css
index 0f2c4b5..f318a40 100644
--- a/src/injections/ccdarktheme.css
+++ b/src/injections/ccdarktheme.css
@@ -150,10 +150,14 @@
   background-color: var(--TWPT-thread-read-background)!important;
 }
 
-ec-thread-summary material-expansionpanel.read .title {
+ec-thread-summary material-expansionpanel.read .title span:not(.icon) {
   opacity: 0.8;
 }
 
+ec-thread-summary material-expansionpanel.read .title .icon {
+  opacity: 0.48!important;
+}
+
 ec-thread-summary material-expansionpanel.checked {
   background-color: #17191c!important;
 }