tests: Trim .nim files trailing whitespace

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

tests/misc/tquicksort.nim

@@ -9,17 +9,17 @@ proc QuickSort(list: seq[int]): seq[int] =
             left.add(list[i])
         elif list[i] > pivot:
             right.add(list[i])
-    result = QuickSort(left) & 
-      pivot & 
+    result = QuickSort(left) &
+      pivot &
       QuickSort(right)
-    
+
 proc echoSeq(a: seq[int]) =
     for i in low(a)..high(a):
         echo(a[i])
 
 var
     list: seq[int]
-        
+
 list = QuickSort(@[89,23,15,23,56,123,356,12,7,1,6,2,9,4,3])
 echoSeq(list)