Use globbing for extension mapping in formatting script

The repository includes a script that formats the example sketch code. This uses a `find` command to recurse through the
example folders and run the formatter on each file with a relevant extension.

Previously a regular expression was used for that matching. Although perfectly functional, the same can be achieved in
an easier to understand and maintain manner using globs.

Author: per1234

examples_formatter.sh

@@ -1,8 +1,12 @@
 # you need to have astyle installed before running this
 find \
   examples \
-  -regextype posix-extended \
-  -regex '.*\.((ino)|(h)|(cpp)|(c))$' -and \
+  \( \
+    -name '*.c' -or \
+    -name '*.cpp' -or \
+    -name '*.h' -or \
+    -name '*.ino' \
+  \) \
   -type f \
   -exec \
     astyle \