更改 pd_background_t 命名

[GregoryLi0]

Changes proposed in this pull request:

• 更改 pd_background_t 命名

@lc-soft

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Codecov Report

Merging #266 (6a8a8ab) into v3.0-dev (059b72d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           v3.0-dev     #266   +/-   ##
=========================================
  Coverage     55.07%   55.07%           
=========================================
  Files            80       80           
  Lines         14889    14889           
=========================================
  Hits           8200     8200           
  Misses         6689     6689           

Impacted Files	Coverage Δ
lib/paint/src/background.c	39.47% <100.00%> (ø)
lib/ui/src/widget_background.c	33.11% <100.00%> (ø)

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