Fix inline resources when saving

[philippjfr]

Fixes #1949

[codecov]

Codecov Report

Merging #1956 (ebbf46a) into master (75edca1) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1956      +/-   ##
==========================================
- Coverage   84.92%   84.90%   -0.03%     
==========================================
  Files         154      154              
  Lines       19003    19010       +7     
==========================================
+ Hits        16139    16140       +1     
- Misses       2864     2870       +6     

Impacted Files	Coverage Δ
panel/io/resources.py	71.62% <100.00%> (+1.10%)	⬆️
panel/template/vanilla/__init__.py	88.23% <0.00%> (-0.66%)	⬇️
panel/compiler.py	10.00% <0.00%> (-0.45%)	⬇️
panel/template/base.py	75.64% <0.00%> (-0.27%)	⬇️
panel/template/bootstrap/__init__.py	100.00% <0.00%> (ø)
panel/template/theme.py
panel/template/theme/__init__.py	95.45% <0.00%> (ø)

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