Lighter excerpt indicator & delete tiddler button

I think it looks better if these are less prominent cosmetically.

Extend the gsd-muted class added in the previous commit to apply an
opacity to the images. Also considered adding a wrapper element
around everything in list-view-suffix, but decided against it for
now.

plugins/gsd5/core/ui/lists/list-view-suffix.tid

@@ -2,16 +2,16 @@ title: $:/plugins/gsd5/core/ui/lists/ListViewSuffix
 
 <$list filter="[is[current]field:gsd_type[action]]">
 <$list filter="[is[current]!field:text[]!field:gsd_complete[true]]">
-<$transclude tiddler="$:/plugins/gsd5/core/images/excerpt"/>
+<span class="gsd-muted"><$transclude tiddler="$:/plugins/gsd5/core/images/excerpt"/></span>
 </$list>
 <$list filter="[is[current]field:gsd_complete[true]]">
 <span class="gsd-muted">(<$view field="gsd_comp_date" format="relativedate"/>)</span>
-<$transclude tiddler="$:/plugins/gsd5/core/ui/buttons/delete-tiddler-button"/>
+<span class="gsd-muted"><$transclude tiddler="$:/plugins/gsd5/core/ui/buttons/delete-tiddler-button"/></span>
 </$list>
 </$list>
 
 <$list filter="[is[current]field:gsd_type[project]]">
 <$list filter="[is[current]field:gsd_complete[true]]">
-<$transclude tiddler="$:/plugins/gsd5/core/ui/buttons/delete-tiddler-button"/>
+<span class="gsd-muted"><$transclude tiddler="$:/plugins/gsd5/core/ui/buttons/delete-tiddler-button"/></span>
 </$list>
 </$list>

plugins/gsd5/core/ui/stylesheet/gsd5-stylesheet.tid

@@ -154,6 +154,10 @@ tags: $:/tags/Stylesheet
   color: <<colour muted-foreground>>;
 }
 
+.gsd-muted svg {
+  opacity: 0.25;
+}
+
 .gsd-list-title input[type=checkbox]{
   display:none;
 }