Utils: Use a full layout row for an aspect for Columns and Forms

Avoids some boilerplate on the user code side.

This seems to be the only existing case. If there'd ever be a case where
this is not appropriate, an extra Row { ... } would solve it.

Change-Id: I1ae1102e895640c0acc03b4949e3baabecfcdc49
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/docker/dockersettings.cpp

@@ -137,7 +137,7 @@ DockerConfigWidget::DockerConfigWidget(DockerSettings *settings)
         Group {
             Title(tr("Search images on Docker Hub")),
             Form {
-                s.imageListFilter, Break(),
+                s.imageListFilter,
                 s.imageList
             },
         },