Fixes a OSD bug when un-/muting and adds a toggle to display volume as 0 when muting (#151)

* added muted_zero option to only display 0 volume in osd when enabled

* Fix OSD brightness persisting overflow class

* Update modules/osd/bar/index.ts

* Apply suggestions from code review

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Co-authored-by: Jas Singh <jaskiratpal.singh@outlook.com>

options.ts

@@ -119,6 +119,7 @@ const options = mkOptions(OPTIONS, {
             radius: opt("0.4em"),
             margins: opt("0px 5px 0px 0px"),
             location: opt<OSDAnchor>("right"),
+            muted_zero: opt(false),
         },
         bar: {
             scaling: opt(100),