fix: Use _path_prepend in profile.d/krew and profile.d/anyenv

Both prepended to PATH directly, so re-sourcing them in the same
shell would duplicate entries — same issue _path_append already
fixed for profile.d/path and rc.d/rvm. _path_prepend keeps the same
priority ordering (these paths still take precedence over the rest
of PATH) while adding the dedup guard.

profile.d/anyenv

@@ -2,7 +2,4 @@
 
 # git clone https://github.com/riywo/anyenv ${HOME}/.anyenv
 
-if [ -d "${HOME}/.anyenv/bin" ]
-then
-  export PATH="${HOME}/.anyenv/bin:${PATH}"
-fi
+_path_prepend "${HOME}/.anyenv/bin"

profile.d/krew

@@ -1,3 +1,3 @@
 if (command -v krew &>/dev/null); then
-	export PATH="${KREW_ROOT:-${HOME}/.krew}/bin:${PATH}"
+	_path_prepend "${KREW_ROOT:-${HOME}/.krew}/bin"
 fi