ros-comm: correcting patch after manual change (resolves #254)

In the commit 21f7799e, I manually
modified the patch, but it slipped my eyes to adjust the line
information in the patch accordingly.
This commit corrects the line information, so that the patch can
now be applied correctly.

recipes-ros/ros-comm/files/0001-make-rostest-in-CMakeLists-optional-ros-rosdistro-30.patch

@@ -62,7 +62,7 @@ index e441b9a..2d52451 100644
  
  include_directories(include)
  include_directories(${catkin_INCLUDE_DIRS})
-@@ -62,6 +62,7 @@ install(PROGRAMS
+@@ -62,6 +62,8 @@ install(PROGRAMS
  
  #Testing
  if(CATKIN_ENABLE_TESTING)