Can't use multiple `--try-amend` statements in Easystack entry

[cgross95]

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We install MATLAB using something like

eb MATLAB-2023b.eb \
    --try-amend="license_server=hostname" \
    --try-amend="license_server_port=12345" \
    --try-amend="key=abc-123"

But the equivalent Easystack will only use the last value, e.g.,

easyconfigs:
- MATLAB-2023b.eb:
    options:
      try-amend: "license_server=hostname"
      try-amend: "license_server_port=12345"
      try-amend: "key=abc-123"

gives a tweaked EasyConfig that only has key=abc123 at the bottom. license_server and license_server_port are ignored.