Rename Micro_SD_Card_Det in Micro_SD_Card_Det2 and create Micro_SD_Card_Det1

As discussed here kicad-footprints!2806 (comment 911587698), I've modified the Micro_SD_Card_Det symbol in order to have only one detection switch instead of two to match some Micro SD footprints.

• Datasheet: https://datasheet.lcsc.com/lcsc/2110151630_XKB-Connectivity-XKTF-015-N_C381082.pdf
• Footprint: kicad-footprints!2806 (comment 911587698)

• Remove the instructional content of this template
• Provide a URL to a datasheet for the symbol(s) you are contributing
• An example screenshot image is very helpful
• Ensure that the associated footprints match the official footprint library
  • A new fitting footprint must be submitted if the library does not yet contain one.
• If there are matching footprint PRs, provide link(s) as appropriate
• Check the output of the automated check scripts - fix any errors as required
• Give a reason behind any intentional library convention rule violation.