qml: Reduce size of recipient selectors

Author: johnny9

src/qml/controls/NavButton.qml

@@ -53,6 +53,7 @@ AbstractButton {
     }
     contentItem: RowLayout {
         spacing: 0
+        anchors.fill: parent
         Loader {
            id: button_background
            active: root.iconSource.toString().length > 0

src/qml/pages/wallet/Send.qml

@@ -89,10 +89,18 @@ PageStack {
                     visible: settings.multipleRecipientsEnabled
 
                     NavButton {
+                        Layout.preferredWidth: 30
+                        Layout.preferredHeight: 30
+                        iconWidth: 30
+                        iconHeight: 30
                         iconSource: "image://images/caret-left"
                     }
 
                     NavButton {
+                        Layout.preferredWidth: 30
+                        Layout.preferredHeight: 30
+                        iconWidth: 30
+                        iconHeight: 30
                         iconSource: "image://images/caret-right"
                     }