Fix input-height-inner wrongly calculated (#28018)

In a scenario where `$input-line-height` or `$input-font-size` are different than `$input-btn-line-height` and `$input-btn-font-size` the final `$input-height-inner` was wrongly calculated.

scss/_variables.scss

@@ -493,13 +493,13 @@ $input-plaintext-color:                 $body-color !default;
 
 $input-height-border:                   $input-border-width * 2 !default;
 
-$input-height-inner:                    ($input-btn-font-size * $input-btn-line-height) + ($input-btn-padding-y * 2) !default;
+$input-height-inner:                    ($input-font-size * $input-line-height) + ($input-padding-y * 2) !default;
 $input-height:                          calc(#{$input-height-inner} + #{$input-height-border}) !default;
 
-$input-height-inner-sm:                 ($input-btn-font-size-sm * $input-btn-line-height-sm) + ($input-btn-padding-y-sm * 2) !default;
+$input-height-inner-sm:                 ($input-font-size-sm * $input-line-height-sm) + ($input-padding-y-sm * 2) !default;
 $input-height-sm:                       calc(#{$input-height-inner-sm} + #{$input-height-border}) !default;
 
-$input-height-inner-lg:                 ($input-btn-font-size-lg * $input-btn-line-height-lg) + ($input-btn-padding-y-lg * 2) !default;
+$input-height-inner-lg:                 ($input-font-size-lg * $input-line-height-lg) + ($input-padding-y-lg * 2) !default;
 $input-height-lg:                       calc(#{$input-height-inner-lg} + #{$input-height-border}) !default;
 
 $input-transition:                      border-color .15s ease-in-out, box-shadow .15s ease-in-out !default;