Update cache metric refresh rate to match other metadata

Move cache duration update from update_properties (~10Hz) to
update_metadata (~0.5Hz) to match the refresh rate of codec,
bitrate, and sample rate. All bottom status bar metrics now
update at the same frequency.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-player"
-version = "0.1.15"
+version = "0.1.16"
 edition = "2021"
 
 [dependencies]

src/player/mod.rs

@@ -249,13 +249,6 @@ impl Player {
                 self.is_idle = idle;
             }
         }
-
-        // Update cache duration (how many seconds are buffered ahead)
-        if let Some(val) = self.get_property("demuxer-cache-duration") {
-            self.cache_duration = val.as_f64();
-        } else {
-            self.cache_duration = None;
-        }
     }
 
     pub fn update_metadata(&mut self) {
@@ -313,6 +306,13 @@ impl Player {
         if let Some(val) = self.get_property("audio-params/samplerate") {
             self.sample_rate = val.as_i64();
         }
+
+        // Update cache duration (how many seconds are buffered ahead)
+        if let Some(val) = self.get_property("demuxer-cache-duration") {
+            self.cache_duration = val.as_f64();
+        } else {
+            self.cache_duration = None;
+        }
     }
 
     pub fn get_position(&self) -> Option<f64> {