regsvr32: Fix issue where DllInstall receives invalid cmdline

[Hugh McMaster]

This patch fixes an issue that allows the option /i:cmdline to pass cmdline to DllInstall with only one quotation mark present (either at the start or end of the string).

If working with /i:"command, DllInstall receives 'comman' as the string, which is neither intended nor valid.

Similarly, if working with /i:command", DllInstall receives command" as the string which, again, is not intended nor valid.

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