remote.h: fix mixed tab/space indentation on continuation lines

[Copilot]

The check-whitespace CI job fails due to mixed tab/space indentation on the get_remote_group() declaration continuation lines in remote.h, introduced in 3e7b9dce27 ("remote: move remote group resolution to remote.c").

• Replace \t\t (2 tabs + 5 spaces) with \t\t (2 tabs) on lines 361-362

// Before
int get_remote_group(const char *key, const char *value,
		     const struct config_context *ctx,
		     void *priv);

// After
int get_remote_group(const char *key, const char *value,
		const struct config_context *ctx,
		void *priv);

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