[Refactor] Removed the to-lp-pd-seq function

I had previously added this because the `bounds` function
was looking for a `LandPatternPad` type as its argument.
This is yet another case where attempting to use types is
difficult if not impossible in JITX. I've converted `bounds`
to use `JITXObject` instead and this removes the
need for the seq function.

src/design/introspection.stanza

@@ -285,13 +285,6 @@ public defn get-pads-from-ports (pts:Seqable<JITXObject>, cxt:JITXObject = self)
     val pds? = get-pads-from-port(pt, cxt)
     value-or(pds?, [])
 
-doc: \<DOC>
-Convert a Sequence of JITXObjects to LandPatternPad objects.
-<DOC>
-public defn to-lp-pad-seq (objs:Seq<JITXObject>) -> Seq<LandPatternPad> :
-  for obj in objs seq:
-    obj as LandPatternPad
-
 doc: \<DOC>
 Retrieve the parent instance (component or module) for a port.
 

src/landpatterns/leads.stanza

@@ -17,7 +17,8 @@ doc: \<DOC>
 Generate the Bounding Dims of a sequence of pads
 @param lp-pads the pads that we want to create a bounding
 rectangle of. These pads should be in the same component for
-this function to make sense.
+this function to make sense. It should be either a
+LandPatternPad or a VirtualPad.
 @param layer-spec Optional layer specifier that will compute
   the bounds based on the geometry in a particular layer.
   If this value is false - we compute the boundary based on the
@@ -27,7 +28,7 @@ this function to make sense.
 that this box is in the frame of reference of the associated component.
 <DOC>
 public defn bounds (
-  lp-pads:Seqable<LandPatternPad|VirtualPad>
+  lp-pads:Seqable<JITXObject|VirtualPad>
   --
   layer-spec:LayerSpecifier|False = false
   expand-by:Double = 0.0