Fix proposal execute button - fixing the math for isApproved

[Viterbo]

Fixes #835, #841

Description

This PR repairs the login behind the condition of isApproved. it also fixes a problem with the .env when it's not present (fresh repo clone).

Test scenarios

• Go to this proposal link (I don't have a Mainnet deployment to show)
• Get logged in (use a non-BP account)
• See that it already shows an execution button

or run it locally with this code:

# clone the repo if you don'e have it
git clone https://github.com/telosnetwork/open-block-explorer.git
cd open-block-explorer
# run the correct branch
git fetch origin
git checkout 835-execute-msig-tx-by-non-msig-accounts-on-block-explorer
yarn
yarn dev

make sure you have the file .env with this code:

APP_NAME=OBE
CHAIN_NAME=telos

then visit http://localhost:8080/proposal/aprfeeburn

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have cleaned up the code in the areas my change touches
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have checked my code and corrected any misspellings
• [x] I have removed any unnecessary console messages
• [x] I have included all english text to the translation file and/or created a new issue with the required translations for the currently supported languages
• [x] I have tested for mobile functionality and responsiveness
• [x] I have added appropriate test coverage
• [x] I have updated relevant documentation and/or opened a separate issue to cover the updates (Issue URL: )

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