Properly align cyclic module error

The "Module graph contains a cycle" error does some aligning to make it easier to parse what modules form a cyclic dependency. The first module is awkwardly misaligned, making it harder to parse what actually is happening:

Module graph contains a cycle:
        module ‘Foo’ (Foo.hs)
        imports module ‘Bar’ (Bar.hs)
  which imports module ‘Baz’ (Baz.hs)
  which imports module ‘Foo’ (Foo.hs)

I propose adding 8 spaces of indentation to the first item which aligns all the modules:

Module graph contains a cycle:
                module ‘Foo’ (Foo.hs)
        imports module ‘Bar’ (Bar.hs)
  which imports module ‘Baz’ (Baz.hs)
  which imports module ‘Foo’ (Foo.hs)