Revert "Cannot have an = sign as an index"

This reverts commit d2ab3f50.
The reverted commit turned out to be a workaroud another problem.
The real fix is submitted in PR #5680
Signed-off-by: Marc Khouzam <marc.khouzam@ville.montreal.qc.ca>

cmd/helm/completion.go

@@ -213,7 +213,6 @@ __helm_convert_bash_to_zsh() {
 	-e "s/${LWORD}declare${RWORD}/__helm_declare/g" \
 	-e "s/\\\$(type${RWORD}/\$(__helm_type/g" \
 	-e 's/aliashash\["\(.\{1,\}\)"\]/aliashash[\1]/g' \
-	-e 's/flaghash\[${flagname/flaghash[${flagname%=/' \
 	-e 's/FUNCNAME/funcstack/g' \
 	<<'BASH_COMPLETION_EOF'
 `