fix(paginator): change class name of increment and decrement icons

Fix such that the previous page navigation button contains an icon with class decrement,
and the next page navigation button contains an icon with class increment. Previously
they were incorrectly swapped.

Noticed during fix for #9278

src/lib/paginator/paginator.scss

@@ -17,6 +17,7 @@ $mat-paginator-button-icon-width: 8px;
 
 $mat-paginator-button-increment-icon-margin: 12px;
 $mat-paginator-button-decrement-icon-margin: 16px;
+<<<<<<< HEAD
 
 $mat-paginator-button-first-last-icon-width: 14px;
 
@@ -27,6 +28,8 @@ $mat-paginator-button-last-icon-margin: 15px;
 $mat-paginator-button-first-decrement-icon-margin: 21px;
 $mat-paginator-button-last-increment-icon-margin: 9px;
 
+=======
+>>>>>>> 0d121793... fix(paginator): change class name of increment and decrement icons
 
 .mat-paginator {
   display: block;
@@ -93,7 +96,7 @@ $mat-paginator-button-last-increment-icon-margin: 9px;
 .mat-paginator-decrement {
   margin-left: $mat-paginator-button-decrement-icon-margin;
   [dir='rtl'] & {
-    margin-right: $mat-paginator-button-decrement-icon-margin;
+    margin-right: $mat-paginator-button-increment-icon-margin;
   }
 }