For the long listing on the Shows List page, increase size of network column

[mglaske]

Describe the bug
When viewing the show list page, the network column sometimes has 2 or more word networks "Animal Planet", which get split to 2 lines, making my OCD show up. :)

To Reproduce
Steps to reproduce the behavior:

1. Go to 'show list'
2. Use wide screen layout
3. Look for Networks with spaces in the name.

Expected behavior
Column width would increase so it doesn't take up 2 lines.

Screenshots

Medusa (please complete the following information):

• OS: ubuntu bionic 18.04
• Branch: master
• Commit: 74c3f12
• Python version: 2.7.15
• Database version: 44.14

Debug logs (at least 50 lines):
General > Advanced Settings > Enable debug
Not relevant.

Additional context
None. Minor nit.