tests: Trim .nim files trailing whitespace

via OSX: find . -name '*.nim' -exec sed -i '' -E 's/[[:space:]]+$//' {} +

tests/collections/tindexby.nim

@@ -11,11 +11,11 @@ type
   TElem = object
     foo: int
     bar: string
-    
+
 let
   elem1 = TElem(foo: 1, bar: "bar")
   elem2 = TElem(foo: 2, bar: "baz")
-  
+
 var tbl2 = initTable[string, TElem]()
 tbl2.add("bar", elem1)
 tbl2.add("baz", elem2)

tests/collections/ttableconstr.nim

@@ -3,7 +3,7 @@
 template ignoreExpr(e: expr): stmt {.immediate.} =
   discard
 
-# test first class '..' syntactical citizen:  
+# test first class '..' syntactical citizen:
 ignoreExpr x <> 2..4
 # test table constructor:
 ignoreExpr({:})