Fix battery detection on systems with multiple ACPI batteries by filtering batteries with 0%

[JBTastic]

Problem:
On many laptops with multiple ACPI-reported batteries (e.g., Battery 0 and Battery 1), the current scripts incorrectly read the first battery’s status. Often, Battery 0 is a phantom or inactive battery reporting 0%, causing wrong battery percentage and remaining time displays.

Solution:
This patch modifies the battery detection logic in the tmux-battery scripts to:

• Prefer the actual active battery (commonly Battery 1) by filtering out phantom batteries reporting 0%.
• Update acpi command usage in all relevant scripts to ignore empty batteries.
• Improve robustness across different hardware configurations.

Impact:
Users with laptops reporting multiple batteries will see accurate battery percentage and remaining time in tmux. This fix improves compatibility and usability significantly.