FIX Correct if syntax in upload script [skip-ci]

[mike-wendt]

To use && we need double brackets otherwise it is interpreted as two separate commands. Updating the other if statements to match for consistency.

Current output from an upload attempt without this fix:

01:59:21.168 gpuCI logger » [10/21/2020 12:38:10]
01:59:21.168 ┌──────────────────────────────┐
01:59:21.168 |    Starting conda uploads    |
01:59:21.169 └──────────────────────────────┘
01:59:21.169 
01:59:21.169 +++ '[' 1 == 1
01:59:21.169 ci/cpu/upload.sh: line 41: [: missing `]'
01:59:21.169 +++ '[' 1 == 1
01:59:21.169 ci/cpu/upload.sh: line 48: [: missing `]'

[GPUtester]

Please update the changelog in order to start CI tests.

View the gpuCI docs here.