Fix hiding of filename label when indexer is idle
This fixes a regression caused by commit 6ea58c0f ("kcms/baloo: make "current indexing" label a full path again"). Prior to this commit, the condition included the boolean "monitor.currentlyIndexing" property.
Using the filePath.length and completionPercentage is insufficient, as the filepath value is only valid when the state is not idle, and may show e.g. a placeholder value during idle state.
Edited by Stefan Brüns