Optimized the `Eq` instance generation by removing the useless `True` at the start

[jaredponn]

This optimizes the generated Eq instances.

For example,

module TEST

import Prelude

record A = { int : Integer }
derive Eq A

would previously generate code like

instance Prelude.Eq A where
  (==) = (\x0 -> (\x1 -> (Prelude.&&) (Prelude.True) ((Prelude.==) (a'int x0) (a'int x1)) ) )
                                   -- ^~~~~~~~~~~~~ this is not necessary

This PR changes the generated code to be as follows

instance Prelude.Eq A where
  (==) = (\x0 -> (\x1 -> (Prelude.==) (a'int x0) (a'int x1) ) )

[jaredponn]

Thanks for the review, I'll merge it now.