modules/power-profiles-daemon: add some right padding

The icon is not really centered in the box. This is likely coming from
a bogus glyph width calculation. It's not a big deal, but that's not
really pleasant aesthetically-wise.

Adding a bit of right padding makes it much more pleasant to watch. It
does not really disrupt a wider display form, like one that
explicitely writes the active profile.

resources/style.css

@@ -140,6 +140,10 @@ button:hover {
     animation-direction: alternate;
 }
 
+#power-profiles-daemon {
+    padding-right: 15px;
+}
+
 #power-profiles-daemon.performance {
     background-color: #f53c3c;
     color: #ffffff;