tests: Trim .nim files trailing whitespace

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

tests/trmacros/tcse.nim

@@ -6,7 +6,7 @@ template cse{f(a, a, x)}(a: expr{(nkDotExpr|call|nkBracketExpr)&noSideEffect},
                          f: expr, x: varargs[expr]): expr =
   let aa = a
   f(aa, aa, x)+4
-  
+
 var
   a: array[0..10, int]
   i = 3

tests/trmacros/tmatrix.nim

@@ -24,6 +24,6 @@ macro optOps{ (`+`|`-`|`*`) ** a }(a: TMat): expr =
 
 var x, y, z: TMat
 
-echo x + y * z - x 
+echo x + y * z - x
 
 #echo x + y + z

tests/trmacros/tstar.nim

@@ -4,7 +4,7 @@ discard """
 
 var
   calls = 0
-  
+
 proc `&&`(s: varargs[string]): string =
   result = s[0]
   for i in 1..len(s)-1: result.add s[i]