Fix balance comparison to zero test

[elmattic]

Summary of changes

Changes introduced in this pull request:

• Add the same flags for forest-wallet balance as forest-wallet list
• Fix wallet send check script

Example:

$ ./forest-wallet list                                             
Address                                   Default Balance
t1crmjzblza7nvhxbpvy2gps7oobypoqbn6ubttwa  X        ~100 FIL
t1e2n3hw3jbbzivjmozqhbh6kd5xktfczqj7fs4xy           500 nanoFIL
t1wlfkoqqh2xqlxj2uew66fmj6s4iobzonal6r64q           0 FIL
$ ./forest-wallet balance t1crmjzblza7nvhxbpvy2gps7oobypoqbn6ubttwa -e 
99999998785327636640 attoFIL

By design, an empty wallet will always print 0 FIL.

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[LesnyRumcajs]

Let's use long flag unless it obvious.

[elmattic]

Sure.

[LesnyRumcajs]

I'd omit short flags unless it's very obvious, e.g., -i for interactive or -f to force.

[elmattic]

Agree.