Fix portfolio change to 0 if balance is zero

If you don't have money in your balance, your "portfolio" change is nothing.

- Positive portfolio change includes if it is zero

src/status_im/ui/screens/wallet/main/views.cljs

@@ -45,7 +45,7 @@
      transaction-history-action]]])
 
 (defn- change-display [change]
-  (let [pos-change? (pos? change)]
+  (let [pos-change? (or (pos? change) (zero? change))]
     [react/view {:style (if pos-change?
                           wallet.styles/today-variation-container-positive
                           wallet.styles/today-variation-container-negative)}

src/status_im/ui/screens/wallet/subs.cljs

@@ -46,11 +46,14 @@
 (reg-sub :portfolio-change
   :<- [:price]
   :<- [:last-day]
-  (fn [[price last-day]]
+  :<- [:balance]
+  (fn [[price last-day balance]]
     (when (and price last-day)
-      (-> (money/percent-change price last-day)
-          (money/with-precision 2)
-          .toNumber))))
+      (if (> balance 0)
+        (-> (money/percent-change price last-day)
+            (money/with-precision 2)
+            .toNumber)
+        0))))
 
 (reg-sub :prices-loading?
   (fn [db]