Revert "Adapt conda.bash for bash associative array"

pyenv.d/rehash/conda.bash

@@ -34,22 +34,14 @@ make_shims() {
 }
 
 deregister_conda_shims() {
-  if [[ -v registered_shims[@] ]]; then # adapted for Bash 4.x's associative array (#1749)
-    for shim in ${!registered_shims[*]}; do
-      if conda_shim "${shim}" 1>&2; then
-        unset registered_shims[${shim}]
-      fi
-    done
-  else
-    local shim
-    local shims=()
-    for shim in ${registered_shims}; do
-      if ! conda_shim "${shim}" 1>&2; then
-        shims[${#shims[*]}]="${shim}"
-      fi
-    done
-    registered_shims=" ${shims[@]} "
-  fi
+  local shim
+  local shims=()
+  for shim in ${registered_shims}; do
+    if ! conda_shim "${shim}" 1>&2; then
+      shims[${#shims[*]}]="${shim}"
+    fi
+  done
+  registered_shims=" ${shims[@]} "
 }
 
 if conda_exists; then