* gnu/packages/emacs-xyz.scm (emacs-telega-server): Update to
0.7.15-1.b4a5e20.
* gnu/packages/patches/emacs-telega-path-placeholder.patch: Match patch with
newer source code.
* gnu/packages/patches/emacs-telega-test-env.patch: Match patch with newer
source code.
Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>