Re-align how prompt indicators work (#9907)

# Description

An extra space slipped into the config alignment PR, and this fixes that
extra space.

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crates/nu-utils/src/sample_config/default_env.nu

@@ -48,9 +48,9 @@ $env.PROMPT_COMMAND = {|| create_left_prompt }
 
 # The prompt indicators are environmental variables that represent
 # the state of the prompt
-$env.PROMPT_INDICATOR = {|| " > " }
-$env.PROMPT_INDICATOR_VI_INSERT = {|| " : " }
-$env.PROMPT_INDICATOR_VI_NORMAL = {|| " > " }
+$env.PROMPT_INDICATOR = {|| "> " }
+$env.PROMPT_INDICATOR_VI_INSERT = {|| ": " }
+$env.PROMPT_INDICATOR_VI_NORMAL = {|| "> " }
 $env.PROMPT_MULTILINE_INDICATOR = {|| "::: " }
 
 # Specifies how environment variables are: