tests: Trim .nim files trailing whitespace

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

tests/pragmas/tpush.nim

@@ -1,15 +1,15 @@
-# test the new pragmas
-
-{.push warnings: off, hints: off.}
-proc noWarning() =
-  var
-    x: int
-  echo(x)
-
-{.pop.}
-
-proc WarnMe() =
-  var
-    x: int
-  echo(x)
-
+# test the new pragmas
+
+{.push warnings: off, hints: off.}
+proc noWarning() =
+  var
+    x: int
+  echo(x)
+
+{.pop.}
+
+proc WarnMe() =
+  var
+    x: int
+  echo(x)
+