Add missing debug installation.

Author: The-Compiler

install-qt.py

@@ -22,5 +22,5 @@ def run(cmd):
     if py3k:
         run('sudo apt-get install -qq python3-pyside{,-dbg}')
     else:
-        run('sudo apt-get install -qq python-pyside')
+        run('sudo apt-get install -qq python-pyside{,-dbg}')