properly defines the valid_types variable in sat_vapor_pres_k

[uramirez8707]

Description
Properly declares local variables as

  logical :: valid_types
  valid_types = .false.

instead of

  logical :: valid_types = .false.

Fixes #1111

How Has This Been Tested?
Ran an AM5 experiment that was failing before: /lustre/f2/scratch/Uriel.Ramirez/am5/2022.04/c96L33_am5f1a0r0_amip/ncrc4.intel21-debug-openmp/stdout/run/c96L33_am5f1a0r0_amip_2x0m1d_192x2a.o269209458

The 2 thread and 1 thread jobs ran successfully:
/lustre/f2/scratch/gfdl/Uriel.Ramirez/am5_mixed_mode_fix/2022.04/c96L33_am5f1a0r0_amip/ncrc4.intel21-debug-openmp/stdout/run/c96L33_am5f1a0r0_amip_2x0m1d_192x2a.o269209951

/lustre/f2/scratch/gfdl/Uriel.Ramirez/am5_mixed_mode_fix/2022.04/c96L33_am5f1a0r0_amip/ncrc4.intel21-debug-openmp/stdout/run/c96L33_am5f1a0r0_amip_1x0m2d_216x1a.o269209950

Answers still reproduce

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[rem1776]

There's a few more instances of this in mosaic2 we should prob also remove

mosaic2/grid2.F90:895:  logical :: valid_types = .false.
mosaic2/mosaic2.F90:433:     logical                                 :: valid_types = .false.
mosaic2/mosaic2.F90:482:     logical                             :: valid_types = .false.