(testsuite) FreeBSD and Solaris sed compatibility fixes.

The linefeed between the final "d" and "}" seems to be significant for
these versions of sed.  And they are quite anal about comments, so
move them outside of the sed statement here.

test/unit/_count_args.exp

@@ -6,10 +6,11 @@ proc setup {} {
 
 proc teardown {} {
     assert_bash_exec {unset args COMP_CWORD COMP_LINE COMP_POINT COMP_WORDS}
+    # Delete 'COMP_WORDBREAKS' occupying two lines
     assert_env_unmodified {
-        # Delete 'COMP_WORDBREAKS' occupying two lines
         /COMP_WORDBREAKS=/{N
-        d}
+        d
+        }
     }
 }; # teardown()
 

test/unit/_get_cword.exp

@@ -6,10 +6,11 @@ proc setup {} {
 
 proc teardown {} {
     assert_bash_exec {unset COMP_CWORD COMP_LINE COMP_POINT COMP_WORDS}
+    # Delete 'COMP_WORDBREAKS' occupying two lines
     assert_env_unmodified {
-        # Delete 'COMP_WORDBREAKS' occupying two lines
         /COMP_WORDBREAKS=/{N
-        d}
+        d
+        }
     }
 }; # teardown()