Unify Windows ICON resource name

src/citra/citra.rc

@@ -5,5 +5,5 @@
 
 // Icon with lowest ID value placed first to ensure application icon
 // remains consistent on all systems.
-GLFW_ICON               ICON                    "../../dist/citra.ico"
+CITRA_ICON              ICON                    "../../dist/citra.ico"
 

src/citra_qt/citra-qt.rc

@@ -5,5 +5,5 @@
 
 // Icon with lowest ID value placed first to ensure application icon
 // remains consistent on all systems.
-IDI_ICON1               ICON                    "../../dist/citra.ico"
+CITRA_ICON              ICON                    "../../dist/citra.ico"