fix simple stand mount, the angles for the capsule indentations in the mount were wrong (at some point the convention changed and this was not fixed)

TinySpHEAR_common.scad

@@ -223,12 +223,12 @@ module mount (angles, wall, stand_wall, separation) {
             // indentations that match the two lower capsule holders
             translate([0, 0, mic_mount_height + mount_height + mount_top_height + 
                        (mic_radius - capsule_height) + capsule_height * cos(elev_angle)]) {
-                rotate([0, (90 - elev_angle), angles[0]]) {
+                rotate([0, (90 + elev_angle), angles[0]]) {
                     translate([0, 0, mic_radius - capsule_height]) {
                         capsule([], 0, 1, ridge_wfit, ridge_hfit, 1);
                     }
                 }
-                rotate([0, (90 - elev_angle), angles[1]]) {
+                rotate([0, (90 + elev_angle), angles[1]]) {
                     translate([0, 0, mic_radius - capsule_height]) {
                         capsule([], 0, 1, ridge_wfit, ridge_hfit, 1);
                     }