Fix progress color in dark theme

resolve #32

src/components/Torrents.vue

@@ -173,7 +173,7 @@
                 :color="row.item.state | stateColor(true)"
                 class="text-center ma-0"
               >
-                <span :class="row.item.progress | progressColorClass">
+                <span :class="getProgressColorClass(row.item.progress)">
                   {{ row.item.progress | progress }}
                 </span>
               </v-progress-linear>
@@ -331,10 +331,6 @@ function getStateInfo(state: string) {
     }),
   },
   filters: {
-    progressColorClass(progress: number) {
-      const color = progress >= 0.5 ? 'white' : 'black';
-      return `${color}--text`;
-    },
     formatNetworkSpeed(speed: number) {
       if (speed === 0) {
         return null;
@@ -448,6 +444,12 @@ export default class Torrents extends Vue {
       === Math.min(this.torrents.length, this.pageOptions.rowsPerPage);
   }
 
+  getProgressColorClass(progress: number) {
+    const color = (progress >= 0.5 || (this as any).$vuetify.theme.dark)
+      ? 'white' : 'black';
+    return `${color}--text`;
+  }
+
   created() {
     this.pageOptions = this.$store.getters.config.pageOptions;
   }