Fix #26653: changed DPI setting in user preferences is not saved as default.

Clamping on load did not match RNA property min/max.

source/blender/editors/interface/interface_style.c

@@ -291,7 +291,9 @@ void uiStyleInit(void)
 	uiStyle *style= U.uistyles.first;
 	
 	/* recover from uninitialized dpi */
-	CLAMP(U.dpi, 72, 240);
+	if(U.dpi == 0)
+		U.dpi= 72;
+	CLAMP(U.dpi, 48, 128);
 	
 	/* default builtin */
 	if(font==NULL) {