run_electrum: small clean-up, and hide DeprecationWarnings if not git
run_electrum: small clean-up, and hide DeprecationWarnings if not git

- rename `is_bundle` to `is_pyinstaller` (no semantic changes, just to clearer name)
- define `is_appimage`
- add comment to explain `is_local`
  - its value is the same as before (but more explicit definition)
- define `is_git_clone`, and restrict DeprecationWarnings to that case

spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,wakiyamap/electrum-mona,spesmilo/electrum,wakiyamap/electrum-mona,wakiyamap/electrum-mona,wakiyamap/electrum-mona,spesmilo/electrum