Make sure that the result FilePaths.findExe() is not a directory

(this happened to me for /opt/homebrew/opt/java which was found
but is a directory)

src/main/java/org/apposed/appose/FilePaths.java

@@ -72,7 +72,7 @@ public static File findExe(List<String> dirs, List<String> exes) {
 				// Candidate is a relative path; check beneath each given directory.
 				for (String dir : dirs) {
 					File f = Paths.get(dir, exe).toFile();
-					if (f.canExecute()) return f;
+					if (f.canExecute() && !f.isDirectory()) return f;
 				}
 			}
 		}