fix(workspace): correct title generartion for notes with sub-hierarchy starting with .md

[Harshita-mindfire]

Basics

• code should follow [[Code Conventions|dendron://dendron.docs/dev.process.code]]
• circular dependency check: make sure your code is not introducing new circular dependencies in plugin-core. See [[Avoiding Circular Dependencies|dendron://dendron.docs/dev.process.code.best-practices#avoiding-circular-dependencies]].
• sticking to existing conventions instead of creating new ones
  • eg: if configuration for utilities are already in one module or package, add future utilities there as well

Extended

• General
  • check whether code be simplified
  • check if similar function already exist in the codebase. if so, can it be re-used?
  • check if this change adversely impact performance
• Operations
  • when shipping this change, will it just work or will it introduce additional operational overhead due to complicated interface or known bugs?
• Architecture
  • check if code is introducing changes on a foundational class or interface. if so, call for design review if needed
    • eg: making changes to DNode

[Harshita-mindfire]

Related issue: #1972 and #856

madge report: now new circular dependencies(64)

[SeriousBug]

Looks good, left one nitpick on simplifying the code.