FIX: missing semicolon in add start voltage funcs.

[juanjospina]

Body

• This PR adds the missing semicolons in the functions:

add_start_vrvi!(data_math::Dict{String,Any}; kwargs...) = add_start_voltage!(data_math; coordinates=:rectangular, kwargs...).
add_start_vmva!(data_math::Dict{String,Any}; kwargs...) = add_start_voltage!(data_math; coordinates=:polar, kwargs...)

The missing semicolon breaks the initialization when using args such as explicit_neutral=false.

• Closes [BUG] missing ; in add_start_vrvi! function that breaks for cases without explicit neutral #480
• Addresses issue identified in Question about the add_start_vrvi!() function #485

Code

• Unit tests were added to test that starting voltage values were added correctly.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.