tests: Trim .nim files trailing whitespace

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

tests/casestmt/tcaseoverlaprange.nim

@@ -8,8 +8,8 @@ type
 
 var
   e: TE
-  
+
 case e
-of A..D, B..C: 
+of A..D, B..C:
   echo "redundant"
 else: nil

tests/casestmt/tcaseoverlaprange2.nim

@@ -6,7 +6,7 @@ discard """
 
 
 
-proc checkDuplicates(myval: int32): bool = 
+proc checkDuplicates(myval: int32): bool =
   case myval
   of 0x7B:
     echo "this should not compile"

tests/casestmt/tcasestm.nim

@@ -25,7 +25,7 @@ of "will", "it", "finally", "be", "generated": discard
 var z = case i
   of 1..5, 8, 9: "aa"
   of 6, 7: "bb"
-  elif x == "Ha": 
+  elif x == "Ha":
     "cc"
   elif x == "yyy":
     write(stdout, x)

tests/casestmt/tlinearscanend.nim

@@ -4,13 +4,13 @@ import strutils
 var x = 343
 
 case stdin.readline.parseInt
-of 0: 
+of 0:
   echo "most common case"
-of 1: 
+of 1:
   {.linearScanEnd.}
   echo "second most common case"
 of 2: echo "unlikely: use branch table"
-else: 
+else:
   echo "unlikely too: use branch table"
 
 
@@ -18,7 +18,7 @@ case x
 of 23: echo "23"
 of 343: echo "343"
 of 21: echo "21"
-else: 
+else:
   {.linearScanEnd.}
   echo "default"