Align the columns in "Create from template" to the columns in "Choose instruments" in the New Score wizard

[ericssonpaul]

Previously, when creating a new score the columns* (edit: no idea how I messed that up) in these two tabs weren't aligned. Having them being the same is a bit more aesthetically pleasing.

Before:

After:

• [x] I signed the CLA
• [x] The title of the PR describes the problem it addresses
• [x] Each commit's message describes its purpose and effects, and references the issue it resolves
• [ ] If changes are extensive, there is a sequence of easily reviewable commits
• [x] The code in the PR follows the coding rules
• [x] There are no unnecessary changes
• [x] The code compiles and runs on my machine, preferably after each commit individually
• [ ] I created a unit test or vtest to verify the changes I made (if applicable)

[cbjeukendrup]

@bkunda Please check if you agree with these new column widths on the "Create from template" page :)