kfileplacesview.cpp delete not used variable s_capacitybarHeight

Raresh Rusrequested to merge
work/nmariusp/s_capacitybarHeight into master

Fix issue "src/filewidgets/kfileplacesview.cpp:63:22: warning: unused
variable 's_capacitybarHeight' [-Wunused-const-variable]
63 | static constexpr int s_capacitybarHeight = 6;".

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