preserve no-op behavior when passing trees built with quasiquotes

Quasiquotes-generated trees have positions since scalameta#3450. Fixes:

error: patch.md:168:1: token not found:
Patch.removeImportee(importee"Future").showDiff()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
java.util.NoSuchElementException: token not found:
  at scalafix.util.TokenList.$anonfun$tok2idx$2(TokenList.scala:27)
  at scala.collection.immutable.Map$WithDefault.default(Map.scala:181)
  at scala.collection.MapOps.apply(Map.scala:176)
  at scala.collection.MapOps.apply$(Map.scala:175)
  at scala.collection.AbstractMap.apply(Map.scala:405)
  at scalafix.util.TokenList.leading(TokenList.scala:15)
  at scalafix.internal.patch.ImportPatchOps$.remove$1(ImportPatchOps.scala:229)

scalafix-core/src/main/scala/scalafix/internal/patch/ImportPatchOps.scala

@@ -4,6 +4,7 @@ import scala.annotation.tailrec
 import scala.collection.mutable
 
 import scala.meta._
+import scala.meta.trees.Origin
 
 import scalafix.XtensionOptionPatch
 import scalafix.XtensionSeqPatch
@@ -200,7 +201,11 @@ object ImportPatchOps {
       allImports.filter(_.importers.forall(isRemovedImporter))
 
     def remove(toRemove: Tree): Patch = {
-      if (toRemove.pos == Position.None) return Patch.empty
+      val isSameInput = (toRemove.origin, ctx.tree.origin) match {
+        case (a: Origin.Parsed, b: Origin.Parsed) => a.input == b.input
+        case _ => false
+      }
+      if (!isSameInput) return Patch.empty
       // Imagine "import a.b, c.d, e.f, g.h" where a.b, c.d and g.h are unused.
       // All unused imports are responible to delete their leading comma but
       // c.d is additionally responsible for deleting its trailling comma.