Fix dimension mismatch with continuous covariates in generative

[justjhong]

Fixes #1488

[codecov]

Codecov Report

Merging #1548 (b170d42) into master (aabf14d) will increase coverage by 0.06%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master    #1548      +/-   ##
==========================================
+ Coverage   91.08%   91.14%   +0.06%     
==========================================
  Files         113      113              
  Lines        9015     9031      +16     
==========================================
+ Hits         8211     8231      +20     
+ Misses        804      800       -4     

Impacted Files	Coverage Δ
scvi/module/_multivae.py	89.83% <40.00%> (-1.50%)	⬇️
scvi/module/_peakvae.py	91.26% <40.00%> (-2.68%)	⬇️
scvi/module/_totalvae.py	88.19% <100.00%> (+0.17%)	⬆️
scvi/module/_vae.py	94.85% <100.00%> (+0.09%)	⬆️
scvi/model/base/_rnamixin.py	92.63% <0.00%> (+1.05%)	⬆️
scvi/model/_totalvi.py	87.59% <0.00%> (+1.98%)	⬆️

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