[Icon Applet] More sensible minimum height

Take into account the label's height for minimum size. When we resize the applet super tiny,
it's likely text wraps onto two lines, so use a two line text as minimum (it already does that for preferredHeight anyway).

Differential Revision: https://phabricator.kde.org/D4477

applets/icon/package/contents/ui/main.qml

@@ -39,7 +39,7 @@ MouseArea {
     width: Math.round(units.iconSizes.desktop * 1.5)
 
     Layout.minimumWidth: plasmoid.formFactor === PlasmaCore.Types.Horizontal ? height : units.iconSizes.small
-    Layout.minimumHeight: plasmoid.formFactor === PlasmaCore.Types.Vertical ? width  : units.iconSizes.small
+    Layout.minimumHeight: plasmoid.formFactor === PlasmaCore.Types.Vertical ? width : (units.iconSizes.small + 2 * theme.mSize(theme.defaultFont).height)
 
     hoverEnabled: true