Copyright.txt: Remove excess indentation

Copyright.txt

@@ -121,14 +121,14 @@ documented in corresponding subdirectories or source files.
 
 CMake was initially developed by Kitware with the following sponsorship:
 
- * National Library of Medicine at the National Institutes of Health
-   as part of the Insight Segmentation and Registration Toolkit (ITK).
+* National Library of Medicine at the National Institutes of Health
+  as part of the Insight Segmentation and Registration Toolkit (ITK).
 
- * US National Labs (Los Alamos, Livermore, Sandia) ASC Parallel
-   Visualization Initiative.
+* US National Labs (Los Alamos, Livermore, Sandia) ASC Parallel
+  Visualization Initiative.
 
- * National Alliance for Medical Image Computing (NAMIC) is funded by the
-   National Institutes of Health through the NIH Roadmap for Medical Research,
-   Grant U54 EB005149.
+* National Alliance for Medical Image Computing (NAMIC) is funded by the
+  National Institutes of Health through the NIH Roadmap for Medical Research,
+  Grant U54 EB005149.
 
- * Kitware, Inc.
+* Kitware, Inc.