latex: Fix enabling of minor modes
latex: Fix enabling of minor modes

TeX-PDF-mode and TeX-source-correlate-mode are minor modes with the
usual functions. They should be enabled using the functions and not by
setting the variables as their docstrings both state.

tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs