Return control to pyenv-uninstall in uninstall/envs.bash (#321)

etc/pyenv.d/uninstall/envs.bash

@@ -6,8 +6,7 @@ uninstall_related_virtual_env() {
   if [ -n "${DEFINITION}" ]; then
     if [[ "${DEFINITION}" != "${DEFINITION%/envs/*}" ]]; then
       # Uninstall virtualenv by long name
-      exec pyenv-virtualenv-delete ${FORCE+-f} "${DEFINITION}"
-      exit 128
+      pyenv-virtualenv-delete ${FORCE+-f} "${DEFINITION}"
     else
       VERSION_NAME="${VERSION_NAME:-${DEFINITION##*/}}"
       PREFIX="${PREFIX:-${PYENV_ROOT}/versions/${VERSION_NAME}}"
@@ -16,8 +15,7 @@ uninstall_related_virtual_env() {
         REAL_DEFINITION="${REAL_PREFIX#${PYENV_ROOT}/versions/}"
         if [[ "${REAL_DEFINITION}" != "${REAL_DEFINITION%/envs/*}" ]]; then
           # Uninstall virtualenv by short name
-          exec pyenv-virtualenv-delete ${FORCE+-f} "${REAL_DEFINITION}"
-          exit 128
+          pyenv-virtualenv-delete ${FORCE+-f} "${REAL_DEFINITION}"
         fi
       else
         # Uninstall all virtualenvs inside `envs` directory too