[3.12] gh-122392: IDLE - Fix overlapping lines in browsers (GH-122392) (GH-124975) (#125062)

gh-122392: IDLE - Fix overlapping lines in browsers (GH-122392) (GH-124975)

Increase currently inadequate vertical spacing for the IDLE browsers (path,
module, and stack) on high-resolution monitors.
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(cherry picked from commit c5df1cb7bde7e86f046196b0e34a0b90f8fc11de)

Co-authored-by: Zhikang Yan <2951256653@qq.com>
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>