Add comma for better formatting

Author: michalsrutek

lib/draggable_home.dart

@@ -310,19 +310,20 @@ class _DraggableHomeState extends State<DraggableHome> {
 
   StreamBuilder<bool> expandedUpArrow() {
     return StreamBuilder<bool>(
-        stream: isFullyExpanded.stream,
-        builder: (context, snapshot) {
-          return AnimatedContainer(
-            duration: Duration(milliseconds: 500),
-            height: (snapshot.data ?? false) ? 25 : 0,
-            width: MediaQuery.of(context).size.width,
-            child: Center(
-              child: Icon(
-                Icons.keyboard_arrow_up_rounded,
-                color: (snapshot.data ?? false) ? null : Colors.transparent,
-              ),
+      stream: isFullyExpanded.stream,
+      builder: (context, snapshot) {
+        return AnimatedContainer(
+          duration: Duration(milliseconds: 500),
+          height: (snapshot.data ?? false) ? 25 : 0,
+          width: MediaQuery.of(context).size.width,
+          child: Center(
+            child: Icon(
+              Icons.keyboard_arrow_up_rounded,
+              color: (snapshot.data ?? false) ? null : Colors.transparent,
             ),
-          );
-        });
+          ),
+        );
+      },
+    );
   }
 }