Update waves.py for nfreq=1

[jtgrasb]

Description

This pull request allows for waves to be set up with nfreq = 1 without producing errors to resolve #308.

Type of PR

• Bug fix

[coveralls]

Pull Request Test Coverage Report for Build 7423551248

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.08%) to 94.058%

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Totals
Change from base Build 7135291663:	0.08%
Covered Lines:	2501
Relevant Lines:	2659

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💛 - Coveralls

[jtgrasb]

I've removed the lines

if radians.size == 1: radians = radians.item()

from the degrees_to_radians() function. There doesn't seem to be a reason for this line. It seems to make the result of degrees_to_radians() 1-dimensional, but it doesn't seem to actually affect any results.