Remove tests that compile now that StrWrap modified

Two tests passed negative Margin and MaxLineLen parameters to StrWrap
routine. Since such values make no sense, StrWrap was modified to make
these parameters unsigned: they were changed from Integer to UInt16.

Author: delphidabbler

Tests/Src/DUnit/TestUStrUtils.pas

@@ -1069,10 +1069,8 @@ procedure TTestStrUtilsRoutines.TestStrWrap_overload1;
   CheckEquals(ResA, StrWrap(Text, 10, 0), 'Test 5');
   CheckEquals(ResB, StrWrap(Text, 10, 2), 'Test 6');
   CheckEquals(ResC, StrWrap(Text, 15, 0), 'Test 7');
-  CheckEquals(ResC, StrWrap(Text, 15, -2), 'Test 8');
-  CheckEquals(ResD, StrWrap(Text, 1, 0), 'Test 9');
-  CheckEquals(ResD, StrWrap(Text, 0, 0), 'Test 10');
-  CheckEquals(ResD, StrWrap(Text, -1, 0), 'Test 11');
+  CheckEquals(ResD, StrWrap(Text, 1, 0), 'Test 8');
+  CheckEquals(ResD, StrWrap(Text, 0, 0), 'Test 9');
 end;
 
 procedure TTestStrUtilsRoutines.TestStrWrap_overload2;