eth,server: Use global total supply instead of L2 supply to calculate participation rate on Arbitrum networks

[leszko]

What does this pull request do? Explain your changes. (required)

Implemented as described here: #2275

Specific updates (required)

How did you test each of these updates (required)

Arbitrum Testnet Rinkeby - before the change

*--------------------------------*--------------------------------*
|                   Total Supply | 6845088.180812007147050307 LPT |
*--------------------------------*--------------------------------*
| Current Participation Rate (%) |                  0.03127051517 |
*--------------------------------*--------------------------------*

Arbitrum Testnet Rinkeby - after the change

*--------------------------------*--------------------------------*
|                   Total Supply |    13688041.821979775736803028 |
|                                |                            LPT |
*--------------------------------*--------------------------------*
| Current Participation Rate (%) |                  0.01563769578 |
*--------------------------------*--------------------------------*

Rinkeby - before the change

*--------------------------------*--------------------------------*
|                   Total Supply | 6843718.370257810730818088 LPT |
*--------------------------------*--------------------------------*
| Current Participation Rate (%) |                 0.007506151076 |
*--------------------------------*--------------------------------*

Rinkeby - after the change

*--------------------------------*--------------------------------*
|                   Total Supply | 6843718.370257810730818088 LPT |
*--------------------------------*--------------------------------*
| Current Participation Rate (%) |                 0.007506151076 |
*--------------------------------*--------------------------------*

Does this pull request close any open issues?

fix #2275

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[yondonfu]

LGTM!