UI: Set min/max zoom levels for preview

Prevents the preview from zooming in or out too far.
Min zoom: 10%
Max zoom: 1000%

UI/window-basic-preview.cpp

@@ -2255,6 +2255,8 @@ void OBSBasicPreview::ResetScrollingOffset()
 
 void OBSBasicPreview::SetScalingLevel(int32_t newScalingLevelVal)
 {
+	newScalingLevelVal = std::clamp(newScalingLevelVal, -MAX_SCALING_LEVEL,
+					MAX_SCALING_LEVEL);
 	float newScalingAmountVal =
 		pow(ZOOM_SENSITIVITY, float(newScalingLevelVal));
 	scalingLevel = newScalingLevelVal;