Python 3: Use 'filename: learnpython*.py' (no '3')

Before renaming, Python 3 filenames were 'learnpython3*.py'.

This commit removes the '3' part from the filename.

To verify that the filenames were named consistently across
translations prior to this commit, and to change this:

```
ack -H 'filename:' python.html.markdown
find . -name "python-*.markdown" -exec ack -H 'filename:' {} \;

sed -i 's/^filename: learnpython3/filename: learnpython/' \
  python.html.markdown

find . -name "python-*.markdown" -exec \
  sed -i 's/^filename: learnpython3/filename: learnpython/' {} \;
```

1 files changed, 1 insertions, 1 deletions

diff --git a/ar-ar/python-ar.html.markdown b/ar-ar/python-ar.html.markdown
index 8aa8dd37..f89c2f25 100644
--- a/ar-ar/python-ar.html.markdown
+++ b/ar-ar/python-ar.html.markdown
@@ -11,7 +11,7 @@ contributors:
 translators:
     - ["Ahmad Hegazy", "https://github.com/ahegazy"]
 lang: ar-ar
-filename: learnpython3-ar.py
+filename: learnpython-ar.py
 ---
 
 لقد أُنشئت لغة البايثون بواسطة جايدو ڤان روسم في بداية التسعينات. هي الأن أحد أشهر اللغات الموجودة.