Remove separate lrelease for linux

Now that the .qm files are generated on the fly by the Makefile,
a manual lrelease step is no longer needed and wouldn't work correctly.

Author: softins

linux/debian/rules

@@ -35,7 +35,6 @@ override_dh_auto_configure:
 	mkdir -p build-nox && cd build-nox && $(QMAKE) "CONFIG+=headless serveronly" TARGET=jamulus-headless PREFIX=/usr ../Jamulus.pro
 
 override_dh_auto_build:
-	cd src/translation && lrelease *.ts
 	cd build-gui && make -j "$$(nproc)"
 	cd build-nox && make -j "$$(nproc)"