Revert "src/mumble/mumble.pro: silence some qmake warnings."

This reverts commit c47d95a.

My working copy had stale qt_*.qm files in src/mumble, so I failed
to catch this during my own testing.

src/mumble/mumble.pro

@@ -349,11 +349,11 @@ CONFIG(no-update) {
 
 	QT_TRANSLATION_FILES_SRC *= qt_cs.qm qt_da.qm qt_de.qm qt_es.qm qt_fr.qm qt_he.qm qt_hu.qm qt_ja.qm qt_pl.qm qt_pt.qm qt_ru.qm qt_sv.qm qt_zh_CN.qm qt_zh_TW.qm
 	for(lang, QT_TRANSLATION_FILES_SRC):exists($$[QT_INSTALL_TRANSLATIONS]/$${lang}) {
-		QT_TRANSLATION_FILES *= $${QT_TRANSDIR}$${lang}
+		QT_TRANSLATION_FILES *= $${lang}
 	}
 
 	copytrans.output = ${QMAKE_FILE_NAME}
-	copytrans.commands = $$QMAKE_COPY ${QMAKE_FILE_NAME} ${QMAKE_FILE_OUT}
+	copytrans.commands = $$QMAKE_COPY $${QT_TRANSDIR}${QMAKE_FILE_NAME} ${QMAKE_FILE_OUT}
 	copytrans.input = QT_TRANSLATION_FILES
 	copytrans.CONFIG *= no_link
 	copytrans.variable_out = rcc.depends