app: Fix build errors.

Author: patniemeyer

gui-orchid/lib/orchid/account/account_selector.dart

@@ -213,14 +213,14 @@ class AccountSelectorDialog extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final size = AppSize(context).size;
+    final appHeight = AppHeight(context).height;
     final cardHeight = 152.0;
     final spacing = 24.0;
     final ypad = 32.0;
     final intrinsicHeight = accounts.length * cardHeight +
         (accounts.length - 1) * spacing +
         2 * ypad;
-    final height = min(size.height * 0.7, intrinsicHeight);
+    final height = min(appHeight * 0.7, intrinsicHeight);
 
     return SizedBox(
       height: height,

gui-orchid/lib/pages/connect/connect_page.dart

@@ -596,11 +596,11 @@ class _ConnectPageState extends State<ConnectPage>
   }
 
   bool get isShort {
-    return AppSize(context).shorterThan(Size(0, 700));
+    return AppHeight(context).shorterThan(Size(0, 700));
   }
 
   bool get isReallyShort {
-    return AppSize(context).shorterThan(Size(0, 590));
+    return AppHeight(context).shorterThan(Size(0, 590));
   }
 
   @override

gui-orchid/lib/pages/purchase/purchase_page.dart

@@ -98,7 +98,7 @@ class _PurchasePageState extends State<PurchasePage> {
                   constraints: BoxConstraints(maxWidth: 500),
                   child: Column(
                     children: <Widget>[
-                      if (AppSize(context)
+                      if (AppHeight(context)
                           .tallerThan(AppSize.iphone_12_pro_max))
                         pady(64),
                       pady(12),