all: change single blank comment to blank line (#22016)

cmd/tools/modules/testing/common.v

@@ -93,7 +93,7 @@ pub mut:
 	failed_cmds   shared []string
 	reporter      Reporter = Reporter(NormalReporter{})
 	hash          string // used as part of the name of the temporary directory created for tests, to ease cleanup
-	//
+
 	exec_mode ActionMode = .compile // .compile_and_run only for `v test`
 }
 
@@ -368,7 +368,7 @@ pub fn (mut ts TestSession) test() {
 	if current_wd == os.wd_at_startup && current_wd == ts.vroot {
 		ts.root_relative = true
 	}
-	//
+
 	ts.init()
 	mut remaining_files := []string{}
 	for dot_relative_file in ts.files {

cmd/tools/modules/testing/output.v

@@ -7,14 +7,14 @@ pub enum MessageKind {
 	compile_end   // sent right after *each* _test.v file compilation, the message contains the output of that compilation
 	cmd_begin     // sent right before *each* _test.v file execution, the resulting status is not known yet, but the _test.v file itself is
 	cmd_end       // sent right after *each* _test.v file execution, the message contains the output of that execution
-	//
+
 	ok   // success of a _test.v file
 	fail // failed _test.v file, one or more assertions failed
 	skip // the _test.v file was skipped for some reason
 	info // a generic information message, detailing the actions of the `v test` program (some tests could be repeated for example, and the details are sent with an .info status)
-	//
+
 	cannot_compile // when the _test.v file compiled with errors
-	//
+
 	sentinel // send just once after all executions are done; it signals that the reporting/printing thread should stop the loop and exit
 }