fix(remotectl): fix four bugs in parser

[directionless]

extractKeyValue used strings.Split so values containing the delimiter (e.g. URLs with colons) triggered an error and dropped the device. parseObjectArray accessed arrayResults[len-1] without a bounds check, panicking when a property-level line appeared before any item. getCurrentIndentationLevel used strings.LastIndex instead of counting leading tabs, misreporting the nesting depth when values contained tabs. parseDumpstate unconditionally advanced the scanner after each parseDevice call; when a sub-parser consumed the next device name as its exit condition, the first property of that device was silently dropped.

• extractKeyValue: use SplitN(..., 2) to preserve delimiters in values
• parseObjectArray: guard against empty arrayResults before index access
• getCurrentIndentationLevel: count leading tabs with a loop
• parseDumpstate: reuse p.lastReadLine when it already holds a device name instead of always advancing the scanner