tests: Trim .nim files trailing whitespace

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

tests/macros/tquotewords.nim

@@ -6,13 +6,13 @@ discard """
 
 import macros
 
-macro quoteWords(n: expr): expr {.immediate.} = 
+macro quoteWords(n: expr): expr {.immediate.} =
   let n = callsite()
   result = newNimNode(nnkBracket, n)
   for i in 1..n.len-1:
     expectKind(n[i], nnkIdent)
     result.add(toStrLit(n[i]))
-  
+
 const
   myWordList = quoteWords(this, an, example)