Remove remaining lightnings from run-tests.php

The classic Windows console only supports the Unicode BMP, so it can't
handle the LIGHTNING MOOD character (U+1F5F2).  It also seems that
common fonts do not support the LIGHTNING (U+2607) character, so a
general removal is appropriate.

However, Windows is already "ready for the future"[1], but PHP for
Windows is not (yet).

[1] <https://devblogs.microsoft.com/commandline/windows-command-line-unicode-and-utf-8-output-text-buffer/>

Author: cmb69

run-tests.php

@@ -1480,7 +1480,7 @@ function run_all_tests_parallel($test_files, $env, $redir_tested) {
 		echo "$i ";
 	}
 	echo "… done!\n";
-	echo "====⚡️===========================================================⚡️====\n";
+	echo "=====================================================================\n";
 	echo "\n";
 
 	$rawMessageBuffers = [];