MAGETWO-67454: Fix Login Popup broken on iPad portrait #6452

Author: Oleksii Korshenko

app/design/frontend/Magento/blank/web/css/source/components/_modals_extend.less

@@ -16,7 +16,7 @@
 
 @modal-popup-title__font-size: 26px;
 @modal-popup-title-mobile__font-size: @font-size__base;
-@modal-popup-breakpoint-screen__m: @screen__m + 1;
+@modal-popup-breakpoint-screen__m: @screen__m;
 
 @modal-slide__first__indent-left: 44px;
 @modal-slide-mobile__background-color: @color-gray-light01;

app/design/frontend/Magento/luma/web/css/source/components/_modals_extend.less

@@ -16,7 +16,7 @@
 
 @modal-popup-title__font-size: 26px;
 @modal-popup-title-mobile__font-size: @font-size__base;
-@modal-popup-breakpoint-screen__m: @screen__m + 1;
+@modal-popup-breakpoint-screen__m: @screen__m;
 
 @modal-slide__first__indent-left: 44px;
 @modal-slide-mobile__background-color: @color-gray-light01;

lib/web/css/source/components/_modals.less

@@ -248,7 +248,7 @@
 //  _____________________________________________
 
 //  Mobile transform to modal-slide
-.media-width(@extremum, @break) when (@extremum = 'max') and (@break = (@screen__m + 1)) {
+.media-width(@extremum, @break) when (@extremum = 'max') and (@break = @screen__m) {
     .modal-popup {
         &.modal-slide {
             .lib-modal-slide();