Add public/img/svg to WEBPACK_DEST_ENTRIES (#11993)

Webpack outputs to this directory so it should be removed during
cleanup. No backport needed.

Co-authored-by: zeripath <art27@cantab.net>

Makefile

@@ -91,7 +91,7 @@ GO_PACKAGES ?= $(filter-out code.gitea.io/gitea/integrations/migration-test,$(fi
 WEBPACK_SOURCES := $(shell find web_src/js web_src/less -type f)
 WEBPACK_CONFIGS := webpack.config.js
 WEBPACK_DEST := public/js/index.js public/css/index.css
-WEBPACK_DEST_ENTRIES := public/js public/css public/fonts public/serviceworker.js
+WEBPACK_DEST_ENTRIES := public/js public/css public/fonts public/serviceworker.js public/img/svg
 
 BINDATA_DEST := modules/public/bindata.go modules/options/bindata.go modules/templates/bindata.go
 BINDATA_HASH := $(addsuffix .hash,$(BINDATA_DEST))