plot_layout_properties(): type and ids fixed for LABEL=FALSE (#604)

[markheckmann]

Fix: This PR corrects the assignment of the placeholder information in plot_layout_properties() for labels = FALSE) (see #604).

Note: Fixes part of the issue. See suggestions at the bottom of #604

---

devtools::load_all()
p <- testthat::test_path("docs_dir/test-content-order.pptx")
x <- read_pptx(p)
plot_layout_properties(x, "Many Contents", labels = FALSE)

BEFORE
Types and type ids are not assigned correctly.

NOW

Types and type ids are assigned correctly (albeit with room for improvement, see suggestion at bottom in #604)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 83.53%. Comparing base (626f18f) to head (995107c).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
R/pptx_informations.R	0.00%	7 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #605      +/-   ##
==========================================
+ Coverage   83.19%   83.53%   +0.33%     
==========================================
  Files          40       41       +1     
  Lines        5720     5832     +112     
==========================================
+ Hits         4759     4872     +113     
+ Misses        961      960       -1     

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